Using the VPI threaded clamp and azimuth change

I have a VPI and I don't use the washer or the clamp!

I DON'T have a VPI but I DO use a washer and a threaded clamp! <;-)

I don't have a VPI but I do use a washer and threaded clamp - on the SME 30. When the LP is clamped in place it is perfectly flat. The washer is metal.
Incidentally, we are seeing more and more record weights on the market that do not give priority to bonding the record to the platter. Usually these are relatively light (300-400gr - much lighter than the SME clamp) and do not screw down.
Rather than channelling disc resonances away through the spindle and main bearing and/or by optimising contact between the record and the platter surface (in the case of SME, covered with 'Isodamp'), they seek to absorb them directly (i.e. into the clamp itself).
Two outstanding record weights of this type are the Kuzma Ebony Record Weight and the HiFi Tuning VRO ('vinyl resonance optimiser -there is a review for those who read German at: 'http://www.fairaudio.de/test/phono/2010/test-platten-klemme-hifi-tuning-vro-1.html).
The Kuzma Ebony is a particularly interesting case since it has been introduced by a company that supplies screw-down reflex clamps as standard on its high-end turntables.
My question is: has anybody had any experience of these clamps - probably 'vinyl resonance tuners' is a more appropriate term - on their turntables as replacements for screw-down reflex clamps? Clearly as a way of dealing with warped or dished records they will not be of much use, but it may be that they do a better job of damping the disc.

I got several new products from herbies audio lab a few days ago. One of them was the new thinner spindle washer. It has the same outside demension and spindle size hole as the stock VPI washer but is about half as thick. It is made from grungebuster material. Grungebuster is more compliant than the VPI rubber washer. This washer works much better for me as I primarily play 180gr and 200gr. new records. They have no warps so, I don't need as much force downward. With the thinner washer, the record is completely flat against the platter when the clamp is tightened. There isn't any dishing effect. It only slightly bends downward when tightening the clamp. Then, when the clamp is tightened the grungebuster washer flattens out and the record becomes one with the platter. It maintains the vacuum seal that the VPI stock washer had. Herbies does make a replacement VPI washer that is listed on the site. This one is too thick. You need to go to grungebuster washers under the metric sizes. The washer size is 32mm outside diameter. It has a 7mm spindle hole and is 1.6mm thick. It only cost $2.29 and was a great improvement for me. It is just the thing for records that have no warps. It keeps them flat against the platter and doesn't dish them. I still use the thicker VPI washer for slightly warped records that need it. Hope this helps someone.

Andy