Two screw options are very welcome when available! I have bought spare plates so I don’t need to change them over, leave them locked in place. Otherwise some thin rubber sheet and the largest contact area you can manage. I have. I have a 4kg set of binoculars on my mvh500 and it works fine, adjust the balance occasionally and tighten the friction sometimes. A solid tripod and a solid surface (bird hide floors can bounce around if people walk about) and you should have a good view.
Peter
Peter