I used a SOTA clamp with good results.
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I think upgrading to the screw-down clamp on my Gyro made a difference.
Unfortunately, I don't think the suspension of the Gyro can handle a periphery ring with enough weight to actually flatten out, say, dishwarped records. Maybe the really thin RCA Dynaflops? Anyway, never seemed like it would be worth the expense for the few Lps that are a problem.
I agree that using a clamp can be very beneficial.
My Basis table and clamp are made for each other, and they work great. And I rarely, (twice, maybe, in 8 years), have had a record warped so much that it affected playback.
The only drawback to the Basis clamps is that they are so $%#^$% expensive. (I think they are running $300 now, (if bought separately from the table.) Ouch! (I know they are very well made, but still, $300?)
My two cents worth.
I have KAB's older rubber record grip (since replaced by this one), and for the $29.95 I paid, it lowers surface noise, reduces record slippage (better pace, tempo, and transients), and makes really thin pressings such as RCA Dynaflex records sound just like full weight LPs.
IMO record weights and clamps would have different but overlapping effects. A record grip like I have absorbs vibrations coming up the spindle, clamps the record to the mat, and absorbs resonances from the record itself. It also has the advantage that you don't have to adjust the loading of a suspended turntable.
A record weight would do similar things, but the mass of it changes the resonant frequencies of the mechanical aspects of the playback. This could be for better or worse, or for both.
Then there are the ones simply designed for resonance control, that neither clamp nor add a lot of weight, such as the Herbie's Supersonic Record Stabilizer.
I agree with Arnold Layne above. I just got a VPI Classic with the clamp and ring, and it really is a joy to use the combo. I even get a bit of a "workout" changing sides, so what the heck! Seriously, have not a/b'd between using them and not using them, but I think they level and smooth everything out, and add even a bit more mass to the platter, which I think is a good thing for the Classic. Jrb25, you should get the HRX weight--you don't have to screw and unscrew the weight. Probably worth the $$ to spare that aggravation.
I've had excellent results using a Black Diamond one-piece carbon fibre screw-down clamp on my VPI Classic. Backgrounds are quieter and everything sounds more resolved and stable, yet it doesn't deaden the sound in any way. The stock clamp and another record weight I tried also brought some benefits, but not to anything like the same degree. The BD clamp is expensive to buy new, though, and rarely turns up used.
I just picked up a Shun Mook record weight second hand, they don't often come up. This is the smaller weight, the stupidly expensive, not the insanely expensive large one. Second hand, it is bearable, just.
Opinions about Shun Mook seem strongly positive, except the price. Well, I have to agree, taking the weight on and off clearly demonstrates improvement in clarity and dynamics. You don't have to listen hard to hear them. It's still insanely expensive new, mind you.
I think the value of a record weight will depend upon (1) the state of one's LPs, if one is using the weight to flatten them, (2) one's personal taste in listening (I like a "lively" sound, myself), (3) platter material, (4) turntable type (belt vs direct vs idler drive), and (5) probably tonearm and cartridge as well.
So far, I have never met a turntable weight that improves the sound, using a Notts Hyperspace, a Lenco with Boston Audio mat, or a Kenwood L07D with its stainless steel mat. The weight was least harmful on the Notts, but not that beneficial, either. On the L07D, the original Kenwood record weight squashes the life out of the music, IMO.