I don't se any real issue with the clamping method in Alt. At least when compared to the standard system it will be pretty positive locking.
The issue I would have is that the Az locking is not particularly secure in the standard mount and it uses the same setup in essence. On a permanent pier I would use a normal bolt not a hand wheel on a bolt so that it could be torques appropriately with a spanner and really lock it down. The couple of EQ5/6 mouts I have seen always seemed a little flimsy to me in that regard.
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