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Replacing Knobs

Discussion in 'Hardware, Setup & Repair [BG]' started by AMUNC, Nov 24, 2012.

  1. AMUNC


    Jan 22, 2012
    Raleigh, NC
    I would like to replace the knobs on my peavey grind 6 string bass. Can I use any knob, or are they not universal?
  2. Jazz Ad

    Jazz Ad Mi la ré sol Supporting Member

    There are 2 main shaft types, split and solid.
    Take off the knobs and see what you have.
    If the knobs are attached with a screw you have solid shaft. If they are force pushed in place they are split shaft.
    Standard diameter for the shaft is 6 mm, it is used the most used but sometimes you get 3.5 mm.
  3. In the U.S., split shafts are 6mm, solid shafts are 1/4".
  4. Hi.

    You have to look what You have, there's way more variables than the ones above.

    From the more common in instruments variety, ~6mm there's:

    6mm solid shaft
    6mm splined (and usually, but not necessarily, split as well) shaft.
    6mm beveled shaft.

    1/4" solid shaft
    1/4" splined (and usually, but not necessarily, split as well) shaft.
    1/4" beveled shaft.

    The beveled ones are less common than the others, found mainly on concentric potentiometers IME, but that's still more than enough variables to get it wrong.

    IMLE the make and model without the exact date or year of manufacture doesn't ensure correct fit.

    So, IME better to measure than guess.

  5. I know this is an old thread, but can you use knobs with a set screw on a split shaft?
  6. BBox Bass

    BBox Bass Supporting Member

    Apr 2, 2011
    NW Pennsylvania
    I've installed knobs with set screws on several of my basses that have split shaft pots. It works best if you put the screw against the shaft and don't try to screw it into the gap.

    To the OP, my Grind 5 has 6mm split shaft pots. I put on a set of push-on Allparts skull knobs.

  7. Hi.

    If the diameters match and You position the set screw onto the slot, yes you can.
    Or, if there's a pointer You want to point at a specific direction, fill the slot with a strip of something hard enough not to compress when tightening the set screw.

    More likely than not though, the knob won't rotate without a wobble no matter what You do.
    It's up to You/Your customer whether that bothers someone or not ;).

  8. Cool. Thanks guys!