John B, I have already done the mod but have not had the chance to see if it made any difference. The GSO mirror cell I have looks pretty simple, and as described in the 2000 S&T report, with the mirror resting on three cork pads at the edge of the mirror.
Unfortunately the weather gods have seen what I've been up to so it may be some time before I can see the results of my efforts, if any.
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