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Replacing the knobs...

Discussion in 'Hardware, Setup & Repair [BG]' started by James Walker, Sep 4, 2020.


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  1. James Walker

    James Walker

    Sep 4, 2020
    I want to replace the factory plastic knobs on my MIM Jazz basses and possibly my CIJ GL Jazz bass. Are the pot shafts on both 1/4" or do they differ in any way? Also, is the shaft for the smaller tone knob the same size as the two larger volume knobs? I would like to replace the existing black plastic knobs with chrome dome or Chrome flat top knobs. Any help will be very appreciated.
     
    JRA likes this.
  2. JRA

    JRA my words = opinion Supporting Member

    James Walker , welcome to talkbass! :thumbsup:

    why don't you remove the knobs from your instruments and take a peek --- all of your questions will be answered! ;)

    good luck getting to know your instruments! :thumbsup:
     
    Spidey2112 and Malcolm35 like this.
  3. TortoiseBass

    TortoiseBass

    Aug 26, 2020
    image.jpg image.jpg
    About this, my knob (not pot) on this bass is loose. How do I tighten it/remove it?
     
  4. JRA

    JRA my words = opinion Supporting Member

    some knobs are on the shafts via pressure/friction, some are on the shafts via set-screw.
    - pressure/friction = pull the knob straight up, absolutely straight up.
    - if there is a set-screw: un-tighten the set screw, pull the knob straight up, absolutely straight up.

    if you think you're going to mess things up = see a tech. but like having babies ( :D ): the first one is a special experience...thereafter = easy peasy.*

    good luck getting your knobs off! :thumbsup:



    * sorry to all moms. :)
     
    Spidey2112 and 68Tele-Bass like this.
  5. Tim Skaggs

    Tim Skaggs

    Sep 28, 2002

    Not sure on MIM and CIJ. As a general rule, pots on imported basses have smaller diameter shaft (6mm / .236”) with coarse splines (18 total splines) and pots on US made instruments have 1/4” diameter shafts with finer splines (I think a total of 24 splines). There are also exceptions to this rule. I don’t know if either you asked about use USA pots.


    Yes, if none of the pots have been changed, all will be the same.
     
  6. Welcome aboard!!
    Post a few pics when you ard done!!
     
  7. JeezyMcNuggles

    JeezyMcNuggles

    Feb 23, 2018
    Santa Maria, CA
    I suck, but nobody really notices
    Just buy knobs with set screw ones. They work for everything. If the pots were never replaced, they have 1/4" posts. But, you have to remove them to check tooth count. And then purchase knibs made for those posts.. Or, just buy set screw knobs. They work with everything.
     
  8. Turnaround

    Turnaround Commercial User

    May 6, 2004
    Toronto Canada
    Independent Instrument Technician, and Contractor to Club Bass and Guitar - Toronto
    But 1/4" knobs, even with set screw, will wobble on 6mm shafts. You need the adapter sleeves:
    upload_2020-9-6_10-5-15.png
     
    Beej and Spidey2112 like this.
  9. JeezyMcNuggles

    JeezyMcNuggles

    Feb 23, 2018
    Santa Maria, CA
    I suck, but nobody really notices
    Every set screw knob I've ever bought came with them
     
  10. Turnaround

    Turnaround Commercial User

    May 6, 2004
    Toronto Canada
    Independent Instrument Technician, and Contractor to Club Bass and Guitar - Toronto
    Lucky you. Every knob set I bought didn't come with them. I like your supplier better.
     
    Beej likes this.
  11. Beej

    Beej

    Feb 10, 2007
    Vancouver Island
    I've replaced many a pot for folks that have used a set screw knob on a split shaft pot, and the set screw has crushed one side of the split shaft, eventually breaking off and rendering the pot useless. Definitely need the adapter sleeves, or a shim in the split, or at the very least, line the set screw up directly with the split. :D
     
  12. JeezyMcNuggles

    JeezyMcNuggles

    Feb 23, 2018
    Santa Maria, CA
    I suck, but nobody really notices
    Q-parts, and the tall P bass knobs I got from china, some black minis to go with my SR, I didn't know they didn't otherwise.
     
  13. Primary

    Primary TB Assistant

    Here are some related products that TB members are talking about. Clicking on a product will take you to TB’s partner, Primary, where you can find links to TB discussions about these products.

     
    May 15, 2021

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