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Thread: How to unscrew Rega RB300 counterweight?

  1. #1
    Join Date: May 2010

    Location: Vancouver, Canada

    Posts: 2,105
    I'm Alex.

    Default How to unscrew Rega RB300 counterweight?

    I'm trying to adjust my cartridge on the Rega RB300, but the counterweight does not budge. I've included the closeup photo of the counterweight -- seems like there is some kind of a screw in there but I have no idea how to get it to loosen. Help!

    https://imgur.com/a/5S6Zt
    Don't you just hate it when you cannot detect where the post ends and a signature line begins?

    Alex.

  2. #2
    Join Date: Apr 2012

    Location: Southall, West London

    Posts: 36,856
    I'm Geoff.

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    Hard to tell from that photo, but it could be a hex socket grubscrew, in which case you'd need an allen key of the right size.

    You should be able to unscrew the counterweight stub from the arm with the weight attached, that might make it easier to work on.

  3. #3
    Join Date: Sep 2014

    Location: brighton uk.

    Posts: 3,466
    I'm jamie.

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    if you save the picture to your pc and blow it up it looks very much like an set screw so yes id say you need an allen key to undo it.
    My System/ Yamaha NS1000M speakers ,Pioneer PLC-590,Sony TTS-8000 turntables,Pioneer PA-5000 and PMAT-1010 Tonearms,AT-ART 7 Cartridge,Denon HA-500 Head Amp, John Wood KT88 Valve Amp, Nakamichi ca5 pre amp,Sony X555ES CD Player,

  4. #4
    Join Date: Aug 2008

    Location: Suffolk, UK

    Posts: 1,308
    I'm Paul.

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    Yes it does indeed look like an hex grub screw, so an Allen key is needed. Be careful though as some people believe that you really have to tighten the grub screw down hard. This is not true and usually just an 1/8th turn after the bottom of the screw contacts the stub should be plenty.
    ~Paul~

  5. #5
    Join Date: May 2010

    Location: Vancouver, Canada

    Posts: 2,105
    I'm Alex.

    Default

    Quote Originally Posted by Primalsea View Post
    Yes it does indeed look like an hex grub screw, so an Allen key is needed. Be careful though as some people believe that you really have to tighten the grub screw down hard. This is not true and usually just an 1/8th turn after the bottom of the screw contacts the stub should be plenty.
    Thanks for your help guys, you were right, Allen key did the job!
    Don't you just hate it when you cannot detect where the post ends and a signature line begins?

    Alex.

  6. #6
    Join Date: Feb 2018

    Location: Belfast, United Kingdom

    Posts: 32
    I'm Artur.

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    It's look like Allen key but is dirty inside. Probably you should use some deeply penetrating cleanser perhaps GT85
    or maybe find something more delicate if you are worried about your tonearm.

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