Homemade dual/tri scope adjustment for cheap

These adjusters are so expensive, so I made myself one. Its a prototype. Its a aluminum bar with holes drilled and nuts used for adjustment. One in back and one in front. Has large adjustment range, solid, and cheap (like 15 bucks total). Yes, it takes a bit of fiddling to get right but once its good it stays.

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Interesting. How do you adjust in the other direction
(side-to-side)?

Peter, great idea! Could you attach a few more images? I'd like to see it in broader outline.