TerryC,
Your use of wedge and mounting plate is a similar solution to what I did using an AstroTrack base and plate. I machined the plate differently so the base is self centering and one is not feeling for the bolt hole to hold the scope.
I made this from a piece of 12mm alum plate which I had on hand; if buying for the job I would choose a thicker plate so the lip was higher. Even so it works well, a lot better than the flat plate supplied with the Questar Tristand.
I appreciate your thought re holding the scope with a single 1/4 inch bolt but the loads are quite low really.
Len.
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