I personally would'nt go over the recommended load limit too much but a little can be done if the gear is well balanced. The problem is getting a good balance, it can change at certain points of rotation as a finder moves away from the axis for example. The clutches are actually small plastic nibs on the end of the lock screws and won't hold the mount still if a big off centre weight is applied. Having the weights on but the scope off will put no stress on the gears if the locks are off, it will just put stress on the bearings which are huge and capable of accepting it in my opinion.
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