What Record Clamp for LP12?

I don't see a viable solution to your idea.

I would not recommend using a clamp such as the Michell. You have to physically push down on the clamp very hard, and then lock it into place. Doing that on an LP12 you risk bending something. On the Gyro, there are felt pads and the plinth is designed to bottom out on these pads so you don't bend anything or put the springs out of whack.

Only clamp that comes into mind that may work would be one of the old monster cable clamps. This clamp is clasp activated, so it forces itself down onto the record when you release the spring tention. It is a bit heavy however.

The best clamp would be a VPI HW19 clamp, but of course you'd have to get your spindle machined to accept a nut.

"I have never heard a table sound better with no clamp and it makes no sense to me that tables are used without a clamp of any kind."

Of course there are designs that should not use a clamp. Those that use a felt mat (Linn, Rega) to decouple the record should be unclamped.

On the SOTA table wich are spring suspended you hold your hand under the table while pushing down on clamp before locking it, can you do something likr that with the LP12 I suppose some dont do what I do but I think it is a good idea.

My Linn LP12 is fitted with a Goldmund relief clamp, in addition to the relief mat made of acrylic which replaces the felt one. It's my cheap man's goldmund ref table. This systems works exceptionally well. I just don't know what the availability of this item is in today's market.

I would not use a clamp with the lp-12. As mentioned you can stress the bearing and damage it. The table was not designed to be used with a clamp. If you are looking for a cheap upgrade I would get the Extreme phono donut mat. Definitely more sense of drive and immediacy without affecting the tonal balance. Also, consider taking off the bottom board and using 3M poly feet (can get at Target) to stick in the corners. When removing the bottom board I noticed a greated sense of depth.