Record clamp

these gizmos, many varieties exist, are made to hold reels onto tape recorder spindles which are the same diameter as TT spindles.

https://www.ebay.com/itm/202881467837?chn=ps&norover=1&mkevt=1&mkrid=711-117182-37290-0&...

simply press on, lift off, lightweight

some will work on a short spindle, some will need a longer spindle, check the shape of the bottom, these look good for short spindle.

others, less money, I just posted the 1st find for the idea.

lab bottle stoppers, drill a hole in something

https://www.google.com/search?q=rubber%20stopper%20chemistry&tbm=isch&rlz=1C1CHBF_enUS949US9...
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I do not understand letting some of the vibration generated by the groove go anywhere than to the stylus/cartridge.

There used to be a company called EON Research that made "The Pod".  It was a lightweight, plastic 3-point clamp that worked pretty well on the short Rega spindle.

Then it was available from Ortofon and Pickering and I think a few others.

If you can find one, it might be worth a try?

https://www.vinylengine.com/library/eon-research/pod.shtml

I had a Rega Planar 3 back in the early 90’s.  I tried a few clamps and weights which were available at the time.  Didn’t really make a difference and I never felt comfortable with a clamp/weight on the very short record spindle. I believe there was a quarter inch to three eights inch  length of the exposed spindle for the weight and it scared the crap out of me.  I was using a Sumiko BP Special (the naked cartridge) and was never crazy about the sound of the combination.  I moved on to a VPI HW19 MK III  and used the Rega RB300 arm with the VPI. 

Still the best design, light and won’t cost an arm and a leg.

https://theguruchoice.com/record-players/best-record-clamp/#record-doctor-record-clamp

https://www.amazon.com/Record-Doctor-Clamp-Black/dp/B077YVJW1T

Cheers George

On MC’s recommendation, I’m trying the Origin One Gravity Record Weight on my highly modified Rega Planar RP3 turntable with a Clearaudio Virtuoso cartridge.
Initial testing shows slight but definite sonic improvement.
The overall sound is smoother yet more detailed with some improvement in sound staging. Not a night and day difference, but a nicer listening experience.