Thanks for the information, Mab33. I am looking to pre-load the VP with about 130 lbs and because the top plate is steel, I thought I would try that first. Could you please specify which EAR Isodamp material you have? I was thinking about just a piece of scrap roofing rubber, which is cheap and very strong.
I was also concerned about the ringing of steel, but granite and aluminum also ring. I figure that in the real world, there will be little impact on the surface of the VP to cause the steel to ring and as it is designed for very sensitive equipment anyway, that should not be much of an issue.
I will try it as soon as I get my massive piece of 1 1/2" steel cut down to size so I can move it. It's not so easy to find a shop to cut such a thick piece.
