I think you are expecting too much. Ball heads are made to lock in any
position. As long as it can reach a horizontal position the manufacturer will be happy. Horizontal is just one of an infinite number of possible positions. I use mine in many positions, depending upon where in the sky the target is; much easier to move the camera than the scope.
If you want to mount it horizontally permanently, why do you need a
ball head at all? Just mount it on a simple right angled bracket.
With a specified load of 20Ibs it shouldn't droop. If it does, THEN you have been short changed.
Incidentally, ball heads are mainly made to be used on photographic tripods, which are often not level, and the shafts are often made
to go beyond horizontal to allow for this.
raymo
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