I have a SME 10 and the screw down clamp works well but it does not correct poorly warped records. BTW @invictus005, SME makes both a screw down clamp and a collect clamp (both are the same reflex design clamps) to be used on non-threaded spindles.
For warped records I use a TTW copper ring clamp with excellent results. There are a lot of very usable and rare warped vinyl records that can be rehabilitated by using a ring clamp.
For warped records I use a TTW copper ring clamp with excellent results. There are a lot of very usable and rare warped vinyl records that can be rehabilitated by using a ring clamp.