VPI TNT help

As VPI is closed for the weekend, looking for some help.

I have TNT Jr.

I got it several years ago and of course upgraded here and there.

I recall using the VPI screw clamp when I first got it, but since have been using various weights.

I am now back to a Black Diamond racing 2 piece screw clamp.

I seem to recall the VPI clamp had a little round foam ring with a hole which went over the spindle, but under the clamp. is that correct?

I ask, because I've noticed with a screw clamp, some records tend to have a small hop or what appears to be a warp at the outer edge of the LP.

Thanks for any info