FretMaestro Tutorials
Four Parts

FretMaestro OMNI Pro:
Engineered for frets on a conical radius fretboard where every fret is a different radius.
Omni Pro is Universal for all fretboard Radii.

Omni Box and
Maestro & Tin group

FretMaestro Radius:
Engineered to match specific fretboard radii.
The right tool when there is extensive string and finger wear in the fretboard.
Made to the following Specific Radii in inches:
7.25 - 8.5 - 9.5 - 10 - 11.5 - 12
14 - 15 - 16 - 17 - 20

TRUE LEVEL:
Every fret identical height from one to the next and what no shop can ever do, every fret exactly matching the fretboard radius which is the only way for a fret to be level across the width of the fretboard.

Three Diamond Files:
150 grit Leveling File + 240 grit Crown Narrowing File + 300 grit finishing file.
Working precision +/- .0005"
Result: the only True Level Frets you have ever seen or experienced.
Fastest smoothest play, deepest bends, bell tone ring notes and intonation, sustain for days.

Dumpster the Sanding Beam:
See how and why 19th century sanding beams are so very wrong.

Part One: Prepare

3rd Party Tools.
Fret Forensics - Knowledge is power.

Part Two: Maestro Technique

The Files.
Holding and using FretMaestro.

Part Three: Finer Points

Save time, save fret material.
Ultra Precision Finesse

Part Four: Guitar Setip

Nut Slots, Saddle/String Action,
and happily skip neck relief.

Guitar work shouldn't be mystery science.

Progress always begins with the audacity to challenge the status quo and the Specialists who adamantly enforce archaic tradition. To evolve, to gain the advantages of advances in technology one must go against the multitudes of Specialists who for their own selfish gains are dead set against any innovation that frees you from being their captive customer.

Traditional guitar tools for fret work have not changed since the 1800’s because no one has had the audacity to challenge traditional 19th century tools and methods of the wizard hat Specialists who benefit from these at the great expense of the rest of us.

19th Century Telegraph required Specialist trained in Morse Code. "What hath God wrought?" Then came the 20th Century and the telephone "Mr. Watson, come here, I want to see you", and the world forever changed, benefitting ordinary people and businesses. The telegraph Specialist begrudgingly had to learn a new job.

The next paradigm shift; cellular phones liberated us from landlines that shackled us to home and office. Nokia jubilantly reaped massive profits... until…

Steve Jobs introduced the iPhone, and almost overnight everyone embraced the newfound freedom of phone calls, internet, email, texting, and a camera, a massive music library, the all-in-one cornucopia of communication, information, freedom, entertainment, and creative power. Tens of thousands of Nokia jobs were displaced and lost because instead of developing their own smart phone, Nokia, in complete denial of the new reality chose to holdfast to the status quo.

The makers and sellers of guitars tools depend on fret tools for 70% of their sales. Repair shops depend on 70% of their income coming from fret work. They are the Nokia of guitar tools, stubbornly holding onto the ad nauseam outdated tools and Specialists who enforce tradition with libel, slander, and defamation campaigns against progress because they depend on us remaining as their captive customers.
The barrier of these archaic 19th century tools is that they require dedicated practice and determination to develop the skills for adapting to fretwork that they were never designed nor intended for.

This is 2025, not 1825.
Guitar tools are the only tools that have not changed in 200 years… tune in to how bizarre that is; the whole world of tools has gone through multitudes of innovations and technological paradigm shifts in the last 200 years, and yet traditional guitar tool and repair Specialists have managed to keep a stranglehold to choke out progress, shackling the rest of us as captive customers to archaic 19th century tools and methods. They pontificate: “It ain’t broke, don’t fix it”. Up to now they have shamelessly gotten away with it.

SixStringers 21st Century Guitar Tools are the disruptive innovative ultra precision DIY Novice Friendly anyone can use without prior experience tools that the jail keeper Specialist hate because now you can do it yourself at home infinitely better than they can ever dream of doing with their archaic tools and methods, and you’re not beholden to paying them anymore, nor are you having to put up with their self-righteous indignant condescending wizard hat antics when you tell them “Hey, you loused my guitar, fix it”, and they tell you “You don’t know what you are talking about, after all you came to me and paid me to do what you do not know how to do.”

Say “No!” to that ad nauseam affront. Give yourself permission to be free of their shackles because now you have the key, DIY Novice Friendly SixStringers 21st Century Guitar Tools.

FretMaestro: The only tool ever engineered that precision levels every fret the exact same height off the fretboard and form the perfect matching radius to the fretboard which is the only way frets can be level along their length and therefore the only way frets can be at all. And it also crowns the frets. Ultra precision level, radius, and crown at the same time. Don’t fret the level, maestro your frets with DIY Novice Friendly FretMaestro.

FretFixxer: The only ever precision engineered Spot Level Tool that levels and crowns a proud fret at the same time to within .0005" tolerance for guitars that have just a few buzzy high frets instead of needing a full-on level.
The other guys, Stew Mac Fret Kisser and Music Nomad’s U-file both destructively bulldoze the fret crown flat forcing you to have or to buy a crowning file that cost just about as much as their so-called spot level Kisser and U-File, effectively doubling the true cost to you. So instead of taking a step backwards ruining your fret crown with those half-baked tools based on 19th century thinking, join the 21st century with DIY Novice Friendly FretFixxer.

Maestro Saddle & Nut Sander: The only tool engineered that sands saddles and nuts to within .0005” ultra precision tolerance. True press fit axles and bearing wheels Vs the other guys’ eccentric bolts, sure grip clamp with textured rubber grip strips, the other guys don’t have, precision .0005” tolerance no measure accuracy the others are completely clueless about, no extra useless parts to pose as something they are not, no gimmicky instructions that are sure to get you in trouble.
SixStringers is all about ultra precision and DIY Novice Friendly easy to use simplicity, because when it comes to real tools, less is more.

SixStringers Precision Engineering is making the full line of essential ultra precision DIY Novice Friendly tools that anyone can use to perfect their frets, nut slots, saddles, lowest possible string action, and more often than not a setup that does not need neck relief because neck relief is not what the Traditionalist Specialist tell you, that “Oh, you must have neck relief to allow for the oval vibration of the strings”, that’s ad nauseam bull, they use neck relief to compensate for their shoddy fret work that then makes for shoddy nut slots that then makes for high string action that also needs neck relief to help overcome their shoddy fret work, because in the simplest terms, the hip to the knee bone to the ankle bone, get one of them wrong and you’re playing with a bad limp, get them all wrong and the play and sound of the guitar is painfully crippled.

SixStringers’ Customer Support: Your success is our success, and we are dead serious that we both succeed. We are always here for you, period. We look forward to customers asking questions because we truly enjoy helping you succeed, guiding you on a journey that at the other side you know how guitars really work, that you gain the knowledge that builds your confidence to do it yourself, and because you know that the right tools for the job are SixStringers 21st Century Disruptive Innovation Guitar Tools.

Often times it is only one or a few troublesome frets, and you want a quick fix to buy more time before doing a full on level.
FretFixxer is the only tool that non-destructively levels and crowns the fret at the same time.

The other guys spot level files are flat so they do what flat files must, bulldoze the crown flat, destroying it, so you must have or buy an expensive crowning file to repair the mayhem their crudely designed tools inflict on your frets.

When you add the price of the crowning file the other guys' tools cost from $170 to about $200 compared to FretFixxer all in one for $99.97

Other tools required to complete the ultimate Guitar and Bass Setup: SixStringers and 3rd Party:

SixStringers has no affiliation with any 3rd party seller. Our goal is to do the shopping for you to make sure you get the right products at the best price.

Guitar Neck Support: 3rd party

There are two I recommend. They self-adjust to balance and establish a rock solid support and also do not extend above the fretboard to obstruct work access.

Two recommended buying Choices plus one for money to burn

Notched Straight Edge: 3rd party

You want a notched straight edge that stands up by itself on the fretboard. Expensive triangle and sculpted ones look pretty but they fall over meaning you must hold on... not good. And the cheap ones are not actually straight.
We recommend this Made in USA company, mid-range price, top notch quality.

SixStringers Saddle and Nut Sander:

For acoustic guitar sanding the saddle after fret level is a must.
SixStringers makes the only True Precision tools for the job.

Inch Pound Torque Driver: Bolt on necks: 3rd party

Specifically for Bolt On Necks. Over time the neck bolts can loosen, or worse, some bozo messed with them.
The bolts/screws must be evenly tight, meaning you need a torque drive to achieve this.
The inch pound range required is 15-20 inch pounds. Start at 15 inch/lbs, test all screws for the driver to click, continue adjusting the torque setting until all screws click at the same inch/lbs.
Never torque in a circle, always go cross corner, then down, then cross corner again, and then down again, this is the correct torque pattern.
Make sure the neck is correctly torqued before doing any work related to the guitar neck, including frets, nuts, saddles, string action, relief. Seriously, we do not make or sell these torque drivers, we have no horse in that race, but we want you to know better and save yourself the very real heartache one always gets from half-baked procedures.

Digital Gauge: 3rd party

Using the included SixStringers fret height gauge will ID the shortest fret but it does not show the big picture.
Fret Forensics tells you everything you really should know before doing any fretwork. It also helps us help you in true detail with our unmatched customer support because we will know exactly what you are working with.
This is why we recommend the Digital Gauge and our free Forensics Worksheet download.
All of these gauges are made in China, spending for a name brand cost more than twice as much for the exact same thing.

NOTE: These brass block gauges have 4 feet forming a 16" radius. Not good for sharper radius fretboards. File down the center 2 feet to get past this limitation.

Two recommended buying Choices plus one for money to burn

SixStringers Radius Blocks for Digital Gauge:

11 Radii to choose from, twice as long as brass block for improved stability and accuracy.

SixStringers Nut Slot Gauge:

Nut slots are a real bear to get right, mostly because the traditional measuring tools are hit and miss 19th century relics.
SixStringers Nut Slot Gauge is super easy to use and dead accurate.
Insert gauge blade into nut slot, retract the blade, when you hear and/or feel a click or drop, the slot is too shallow. File a bit at a time, checking as you go. When the blade slides out without a click or drop the depth is right.

Glide Strip:
If you do several guitars this is where to get more Glide Strip on the cheap, and probably enough for a lifetime.
Do not buy another brand because this material is the correct 0.005" gauge to be compatible with FretMaestro.
SixStringers has no affiliation with any 3rd party seller. Our goal is to do the shopping for you to make sure you get the right products at the best price.

String Action Gauge: 3rd party

After true leveling the frets and then dialing in the nut slots the next step is setting string action, and a good gauge is an absolute must have. See link for 3rd party highly rated fair price gauge.
There are very expensive ones, and very cheap ones, price either way does not mean accuracy. Here are two we like.

Dry Lube Spray: 3rd party

Treat every diamond fret file with dry lube before using. Really. Do not use silicone or teflon both of which will build up in the file, and we do not want that. Here are the right ones.

Belt Sander Eraser: 3rd party

For cleaning diamond files when filing nickel frets. Use often as you work because nickel is soft and wants to clump into the diamond grit which then prevents the file from cutting. Get the eraser, and use it, no matter what diamond file you use.

Truss Rod Wrench:

Most guitars come with the correct truss rod wrench, some do not, and others are misplaced.
WARNING: using the wrong wrench size will ruin the adjuster nut, and that's expensive trouble.
BE SURE... NEVER use a wrench that is not the ideal fit, and never tighten the rod when under string tension because this could twist the rod anchor and that's it, you have a giant repair bill that may cost more than the guitar is worth.

Nut Slot Files:

Nut slots almost always need adjusting after fret level.

Nut Slot Files need to feature a half round cutting edge for proper string seating.

Nut slots should never be more than .003" wider than the string gauge, ideally no more than .002"

Music Nomad files claim .01" for 1st string, but measure the ends of their .01" file, it is .013", then measure the full length of the file on the diamond, it is .015" to .017" because their file is warped. Numbers don't lie, dishonest companies do.

StewMac prices $480 for 6 files, get a life.

Then the budget round files - the smallest is 0.02" far too big for .0085" to .017" strings.

I cannot in good conscience recommend any of these nut slot files, all are off by the numbers.
Which is why...
SixStringers is developing DIY Novice Friendly True Precision Nut Slot Files: stay tuned.

Sandpaper:

Simple inexpensive sandpaper works wonders, and is 20x more affordable than those expensive gimmicky fret pads. You need, 600, 800, and 1,200 grit. That's it.

Fret Polishing:

Some people think that mirror shine frets are the thing. But 15 minutes of play and the mirror is a spider web.
Shops use mirror shine for two reasons:
1. the high reflection hides the flaws of their work.
2. deceive customers into thinking that the shine means they got their money's worth when all too often this is far from reality.

To get a mirror shine, most people use a Dremel tool buffer. Do not attempt to shine a fret in one session as this risks overheating and softening the fret glue - real trouble.
Instead, do about a 1/3 polish, move to next fret, do all frets, then come back and do the 2nd 1/3 polish, then the final 1/3, it takes no longer to do and saves you a real headache.