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I was thinking up idea's similar to this, I wonder though if gravity is the only thing holding the altitude in place?
Perhaps the bearings are loosened slightly to allow adjustment, then when positioned the cap-head bolts are torqued down to lock it in place.
Edit: Ah yes, that is the idea... not sure I like it.
I wish people would stop hyping with terms like 'aircraft grade' and 'aerospace grade' aluminium, there really is nothing exotic about the alloys.
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