How tight do you tighten a record clamp

@g11657 Great question - I've always wondered.

I have an MMF-5 with felt mat and was always thinking I'd might pull the center down too much and make the disc concave. FWIW, I always just go finger tight to make it snub, not finger tight till I can't turn it anymore.

 I just bought a Herbies mat, but haven't received it yet. I'm thinking the platter mat will make a difference depending on how flexible it is.

On my VPI I tighten the clamp until the platter turns and then hit the start button.  It works.

I barely ever use the clamp on my VPI. When I do use it I make sure not to make it too tight!

Put a rubber washer about 1/8" thick down over the spindle, then put on record then clamp. That takes out most warps as it dishes down against platter slightly. 

8.7 Newton.meters of torque.  No more; no less.