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How to increase the inner diameter of a plastic knob

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  • #16
    Re: How to increase the inner diameter of a plastic knob

    Or, bit in a vise and slowly spin the knob by hand.
    Dave, Ambassador/Writer/Artist for Seymour Duncan

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    • #17
      Re: How to increase the inner diameter of a plastic knob

      Originally posted by NegativeEase View Post
      I just did this with a stepper a few weeks ago. -On the GK style plastic knobs that have the gray cap so the stepper easily widened the channel and protruded out the other side with the gray cap off.

      Second, you can absolutely do this with 32nd or 64th bits . -I used to this in my sleep as a kid when adding weird knobs to solid posts.. I think the difference here is Guitar Doc is giving you the more correct Luthier approach, I was giving you the home solution because as indicated I said I'm guessing you are going old school without specialty tools.
      Well, of course a step drill will work on a hollow cylinder!!! (And that's effectively what you have if you are working on a knob that has a removable cap). But I don't think that's what we have here.

      The suggestions that I gave, or the ones about doing it by hand are the most appropriate.
      Originally Posted by IanBallard
      Rule of thumb... the more pot you have, the better your tone.

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      • #18
        Re: How to increase the inner diameter of a plastic knob

        Originally posted by Mincer View Post
        Or, bit in a vise and slowly spin the knob by hand.
        Yes, this is the best way to do it if the "correct" tools aren't available.
        Originally Posted by IanBallard
        Rule of thumb... the more pot you have, the better your tone.

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        • #19
          Re: How to increase the inner diameter of a plastic knob

          I would start the hole with a hand reamer, going as far as you can that way. Then finish it off with a drill (drill press, if you have one). The reamer helps to ensure that your hole doesn't drift off center.
          Originally posted by LesStrat
          Yogi Berra was correct.
          Originally posted by JOLLY
          I do a few chord things, some crappy lead stuff, and then some rhythm stuff.

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          • #20
            Re: How to increase the inner diameter of a plastic knob

            The hole won't drift if you use conventional drill bits progressively wider in tiny increments. Certainly it can if you go right to the final size.

            That's NOT to say that using a reamer is NOT a good idea, but it is actually pretty easy to get the opening of the hole too wide using a reamer by hand.
            Originally Posted by IanBallard
            Rule of thumb... the more pot you have, the better your tone.

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            • #21
              Re: How to increase the inner diameter of a plastic knob

              BTW, I will be working with these two knobs - the Fender Jazz Deluxe Stacked Concentric knobs - PN 004-9411-000. The top piece ID is 3/16" (0.1875") and the bottom piece ID is 1/4". I need to increase the top piece ID to fit a 6mm (0.236") pot shaft, and the bottom piece ID to fit a 8mm (0.315") pot shaft.

              Based on all the helpful replies so far, it seems i will be fine if i take it slow, take it in increments, and do as much by hand vs electric to start with. Thanks!

              Click image for larger version

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              Sanford: "The hardest part about tone chasing is losing the expectations associated with the hardware."

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              • #22
                Re: How to increase the inner diameter of a plastic knob

                ^ +1
                Originally Posted by IanBallard
                Rule of thumb... the more pot you have, the better your tone.

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