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Malcolm, a great job. I've been pondering the problem of keeping the Altitude rings on the bearings, and the idea of tabs is a good one. Depending on the depth of the rocker box cutout, the side struts should keep the scope from sliding sideways, but with the relatively shallow cutout you've used, you need the tabs. This will also allow the rocker box to be lighter.
Obviously, solving a design problem can be done in a number of ways, and yours is a more elegant solution than my original idea of using a stepped ring.
I also like your idea of the dowel tripod. The only advantage of a photo tripod that I can see would be the ability to level the ground board on an uneven surface.
I'll post some photos of my attempt in a few weeks, as I should have my workshop up and running in our new house by then.
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