I used a Michell clamp for a brief time with mixed results. Ultimately my Spacedeck sounded better "clampless". The Boston Audio Mat-1 is a great match for Notts. I have one on my Spacedeck and have heard it on the Interspace too. Until you can lay your hands on one, ditch the foam cell mat and spin the record directly on the platter. Much better.
Oz
Oz