This subject has come up at least 100 times on AK with a mixed bag of claims. Some tables had a weight/clamp as part of the mfgs design as in the VPI HW-19, other tables the mfg didn't offer a weight/clamp. I have both Orsonic and Monster Cable clamps which are rebranded Orsonic. I use the Orsonic clamp but I have never been able to hear a difference with it or without it. Also I don't knowingly purchase any warped records, made that mistake once and wiped out a very short stylus on an expensive cartridge. IMO a weight/clamp is minimally effective flattening a warped record since it only covers the center of the record. My recommendation is if you want to try something that won't do any harm go with a clamp but don't expect to hear any difference, just consider it as eye candy and if you get any more out of it you hit the lottery.