As far as flattening warped records nothing works like vacuum.
I had a Star for many years and ended up using the platter/bearing and vacuum system from it in a diy turntable... the vacuum hold always worked flawlessly (except for really dished records where you need to find a way to push the edge of the record down till the vacuum grabs).
Recently I"ve made a diy direct drive tt which uses a normal clamp arrangement and while very good I really miss the vacuum of my other tt.
I had a Star for many years and ended up using the platter/bearing and vacuum system from it in a diy turntable... the vacuum hold always worked flawlessly (except for really dished records where you need to find a way to push the edge of the record down till the vacuum grabs).
Recently I"ve made a diy direct drive tt which uses a normal clamp arrangement and while very good I really miss the vacuum of my other tt.