Although I don't know what mount you have it is probably the the same problem i have seen a number of times with two mounts that i was asked to repair.
When stripping down the mount I found that all components that made up the gears and cogs which controlled the movements were entirely made of plastic, sad but true, as they charge plenty for these mounts and scopes.
However I found in both instances that a very small plastic lug had been snapped off which in turn enabled the spindle which held the cogs in place to slip, there fore preventing the cogs to engage at certain angles of movement.
If the setup were dropped, as in your case this may have caused your problem.
They are pretty easy to dis assemble, so have a look and see the problem if you feel comfortable about the job.
Hope this helps a bit, however this may or may not be the case with your mount.
Leon
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