Converting spit shaft pots to set screw?

Discussion in 'Luthier's Guitar & Bass Technical Discussion' started by mcknigs, May 4, 2016.

  1. mcknigs

    mcknigs Supporting Member

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    Picked go a Squier J-bass with split shaft pots and Strat-type knobs. I'd like to switch to regular J-bass knobs. There are some set-screw J-bass knobs at the local music store with metal cylinders in the package. Are those so I can slip them over split shaft pots and tighten the set screws to them?
     
  2. poolshark

    poolshark Supporting Member

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    Yes. Allparts sells brass sleeves as well. I have a bunch.
     
  3. AdmiralB

    AdmiralB Silver Supporting Member

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    Those don't convert to set screw...they convert a 6mm shaft to 0.250". If you tighten the screw against a 'side', you'll still collapse the shaft.

    You have to align so that the screw impinges on the 'slot', parallel.

    I usually fill the slot and external knurling with JB Weld, then slip the sleeve on. Then I don't have to worry about alignment.
     
  4. swiveltung

    swiveltung Member

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    I have done it by cutting a brass shim to put in the slot. Worked fine, although a PITA to do.
     
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  5. mcknigs

    mcknigs Supporting Member

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    Looking around online I see some J-bass knobs that appear to be made for use with split shaft pots. Makes more sense to just get those. ¿Si?
     
  6. AdmiralB

    AdmiralB Silver Supporting Member

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    Yeah, I agree on both counts! I've also used pieces of popsicle stick. Then I just figured out that epoxy was a lot easier, albeit messier if you're not careful.

    Sure, if the right parts are available, always best to do the least-invasive thing IMO.
     
  7. poolshark

    poolshark Supporting Member

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    You *can* collapse the shaft if you tighten too much, so I agree that it's safer to align the screw with the split in the shaft. To say they don't convert to set screw is a little off, though - how else would you put set screw knobs on, say, a Les Paul? You could just align the screw and split without using a sleeve, but I don't know of any split shaft pots that measure .250". Nobody wants wobbly, cockeyed knobs. :D
     
  8. AdmiralB

    AdmiralB Silver Supporting Member

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    If you had set-screw knobs for 6mm pots, they would work fine on a knurled/split pot (I have done this). The wobble is due to the diameter mismatch, not the fact that it's a split shaft.
     
  9. poolshark

    poolshark Supporting Member

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    Maybe in the short term, but if you plan to keep the bass long term, I'd get parts that conform to standard specs. It doesn't mean much now, but standard parts will be higher quality and more readily available in the future. It'll mean a pot shaft sleeve for now - at least until you replace or upgrade pots and electronics - but that's about the least invasive 'mod' I can think of.
     
  10. poolshark

    poolshark Supporting Member

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    Totally get it. Who makes set screw knobs for 6mm pots?
     
  11. whoismarykelly

    whoismarykelly Oh look! This is a thing I can change!

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    Parts houses selling to countries that primarily use the metric system.
     
  12. mcknigs

    mcknigs Supporting Member

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    Replace the pots? And ruin the collector value of my Squier? ;)
     
  13. AdmiralB

    AdmiralB Silver Supporting Member

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