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KB3 Keystone Guitar Tuning Machines - 3-Per-Side Bolt Bushing

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TonePros Kluson KB3 guitar tuning machine was inspired by today's professional guitarists who want to retrofit newer guitars for vintage mass and tone. Now even older instruments that have been modified can be returned to a more vintage weight and mass. TonePros now makes this possible with high technology and quality, with a new 15:1 Tuning Ratio, quality gear components, and the tightest tuning feel of any tuner of this format. TonePros Kluson B3 tuners fit any guitar with 25/64ths large hole/bolt bushing format without modification. B3 series tuning machines come with the same vintage Butterscotch Keystone buttons of the 33 series. Expect improved tuning performance with vintage appearance. 16:1 gear ratio, 25/64" shaft size. Retrofit your vintage guitar with no modification.


  • 3 per side
  • Bolt bushing
  • Keystone button
  • No guitar modification

KB3 Keystone Guitar Tuning Machines - 3-Per-Side Bolt Bushing Specifications:

  • 16:1 gear ratio
  • 25/64" shaft size
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  • Free Standard Ground shipping (48 contiguous states, some overweight and Used/Vintage items excluded).
  • Orders placed before 3 p.m. ET usually ship the same business day.
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