Hi Wizzy,
Looks good but the only weak point I can see in that design is the way you want fo fiz the cap into the tube.
It does not matter how tight you press the screws against that cap the danger is there that it does have some movement after mounting your telescope on it.
Why not use a V groove, make the end of the fixing screws in a slightly different angle and so it will be forced downward unto the tube and there is no danger that anything will lift up.
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