Two pieces that clamp to the upper ring. One is flat, the other has a channel .6" deep. They are held together by 6-32 screws. The top is through holes; the bottom is tapped. They were supposed to be identical in thickness, width, and length; but I only managed within .01", which was good enough for this application.
Another piece of acetal is perpendicular, held to the to clamp by 6-32 screws; again through holes on top, tapped holes underneath. The base for the finder is held to that piece with 6=32 screws into tapped holes. The ugly mistakes (wrong position holes and counterbores) are hidden under the finder base.
Why 6-32? Those taps are easy to break, and I broke one while doing so, but the finder base holes were that size, and there is no load carried by any of them.
Downside: adds a few ounces to front of scope, affecting balance slightly. I have a easy, sleazy way to add weight on other side of altitude bearing, but I am looking for a way to do it that provides more precise adjustment.
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