SINCE 2010



BUZZ Killer


For all instruments - 132 mm 

This innovative tool can reproduce the fretboard relief for instant localized fret leveling with the strings on™No need to straighten the neck or remove the strings for leveling, unless you still want to level the frets the old way without the strings or/and with the neck set straight. With Buzz Killer single fret and spot leveler you can fix buzz very quickly. You won't need to stop playing! You can refinish the frets later, if not strictly necessary like on an average shop-repair. Its base can feature a sequence of abrasive and protective zones that will file down only the higher fret(s). You can simply place the base of the tool on an good working area adjacent to the buzz and adjust the tool so that the surface of the base comes in contact with all of the frets below. Then, place the tool in the buzzing area and level it. If the area to level is straight (e.g. neck relief set to zero) the BUZZ Killer can be also left straight. Thanks to its adjustability it can work also like a "copy and paste" tool that replaces any bad working shape of a fretboard area with a nearby good working one. Abrasive and protective areas of the tool base can be arranged depending on quantity of the frets that need to be leveled. It can level also one fret at a time in each area of the fretboard, adjusted substantially straight or curved as desired. It comes preloaded with #320 grit abrasive plus a refill roll. BUZZ Killer spot fret leveling tool has been selling worldwide since 2011. Generally, it comes set straight.

The BUZZ Killer tool has been provided with both materials arranged in a PLANAR surface since 2011. It is covered also in the manual provided to worldwide customers since 2011. Described is a method for arranging or adjusting the different types of areas in a way that they all result in a unique planar surface. A method to check their level against another planar surface with a backlight source has been provided since the beginning. Here is the BUZZ Killer manual including how abrasive and non-abrasive materials can be arranged planar.









"The sandpaper can be in just the center or across the whole bottom of the “beam” depending on how many frets need to be knocked down."

March 2, 2014 - Adams Guitar Repair CALIFORNIA (single fret leveling with the BUZZ Killer)


"How did I get by before I had this?"

April 20, 2015 - Decibel Guitars CANADA (spot leveling with the BUZZ Killer tool)



More information about Reference fret level


The Buzz Killer Tool is protected under U.S. Patent number 9,224,369



RR Kit (reload/refinishing kit)

Reload And Refinishing Kit is all you need to reload the leveling tool and crown the frets after leveling them with one of our systems. The file in the Kit typically covers two or more fret level works. LittleBone #150 grit would last more than the LittleBone #400 grit but it would also leave deeper marks to refinish. Advise when you contact if you prefer LB150 in your Kit, instead of the LB400.


It contains:

-1 LittleBone Fret File #400grit

-1 roll 0.64mm x 2.9m self-adhesive abrasive #320 grit for reloading and refinishing that will replace the little roll coming with the stand alone tool

-2 Masking size of masking tape for fretboard protection (9 mm and 18 mm)

-1 abrasive fiber #600 grit for refinishing




*Kit is sold only with one of our fret leveling tools for additional US$38.

Luthier tools


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Price list

REMINDER: to buy our tools please make sure to visit the How to buy page first. Thank you 

Prices are in USD

Final shipping price may vary depending on volume, weight and final destination of the order.

International shipping price is minimum $32. At the moment most destinations are covered by EMS which is quality service but it can be more expensive than certain other services that we have been using until a few years ago which aren't available at this time.

*There might be some lower prices for those Countries that still offer economy shipping services. Please let us know where you buy from so we can check the latest shipping options and prices for your Country.

RED is out of stock

RR Kit is accessory (sold only with a leveling tool)

R.M.KATANA for guitar $220 +Shipping  $32
R.M.KATANA for guitar Limited Edition 440mm $195 +Shipping  $32
R.M.KATANA for bass $255 +Shipping  $42
R.M.nanoKATANA *uke $145 +Shipping  Ask
R.M.BUZZ-Killer single fret and spot leveler  $80 +Shipping  Ask
R.M.LITE for guitar  $40 +Shipping  Ask
R.M.LITE for bass  $55 +Shipping  $38
Rocking File  $18 +Shipping  Ask
UNDERSTRING FLK mini  $59 +Shipping  Ask
RR Kit (reload/refinishing)  $38 Accessory  
LittleBone #400 grit  $20 +Shipping  Ask
LittleBone #150 grit  $24 +Shipping  Ask

LittleBone DoubleAngle #400 grit

 $28 +Shipping  Ask
LittleBone DoubleAngle #150 grit  $28 +Shipping  Ask

LittleBone DoubleGrit


 $28 +Shipping  Ask
LittleBone ice #320 grit  $28 +Shipping  Ask
LittleBone ice #150 grit  $28 +Shipping  Ask
LittleBone ice DoubleGrit  $42 +Shipping  Ask
LittleBone ice Special  $38 +Shipping  Ask
Digital Action Gauge  $36 +Shipping  Ask
FRET RAIL mini  $16 +Shipping  Ask
Feather File for nut   $20 +Shipping  Ask
BOOMERANG FRET FILE  $43 +Shipping Ask
TREM GUARDIAN  $39 +Shipping $15
DRAGONCLAW  $25 +Shipping Ask


About Rectify Master

RECTIFY Master focuses on research and development of innovative and quality luthier tools. Setting new standards since 2010. With over 30 year experience. Beware of imitation.

TOKYO, Japan

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