Where to find LP clamps?

Marakanetz, I have to take exception IMO to your description of firm clamping as causing a 'vast sacrifice of details'. The HF attenuation you hear is the reduction of spurious resonances in the record itself, which although sometimes regarded as adding pleasant (if inaccurate) 'air' to the presentation, are not increasing transparency to recorded detail - on the contrary, they're reducing it.

I agree with Zaikesman. The same thing takes place when folks use "springy" unsupported platter mats such as the Ringmat, etc... These types of devices artificially boost the high frequencies, making a dull recording or improperly matched phono system sound more "alive" and / or "open". Under extreme test conditions, one can even measure reduced tracking ability when using unsupported platter mat's. As such, all they can do is reduce a phono system's ability to perform to full potential. Sean
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I might argue on that since Michell uses an acrylic platter that I cannot consider it "springy" or unsupported and the clamp realy works best if only applied without locking on the Michell. The same I can say about Oracle tables where you should only slightly screw the clamp to touch the label. Simply saying when you couple a record directly to the platter the minimal clamping is sufficient and best.

M., you are correct in pointing out (as I also referred to in my first post) that the platter/mat situation makes a difference in these regards. In addition, I do think it is possible in some instances, with a soft mat and a thin-vinyl pressing, to 'over-clamp', deforming the record and placing it under stress. Although I doubt that the light weight of the Michell clamp by itself, untightened and acting merely with gravity, could have much of a positive effect (in fact, it could have a deleterious effect if allowed to vibrate), at least we agree that it is a good clamp at a low price.

Thanks everyone for your ideas/suggestions/discussion. It's been enlightening!