For some time, my approach is to look up manufacturer torque specs, use torque driver and tighten to that spec. Every mount that I have done for perhaps 10 years gets a drop of blue loctite into the hole in the receiver - I have never used the loctite for the ring cap screws, and do not intend to. Some claim to be able to hit adequate torque by "feel" - maybe they can - turns out that I can not - more power to them! Almost always, I end up over tightened - too long as underground miner, I guess. If dealing with slotted screws or Allen head, then make sure the driver is snug fitting to minimize deformities and slips. Using a torque driver that you have no reason to know is calibrated or in spec is likely wasted time - in the end, does scope move or not - was scope body deformed by the tightening? "Over tightening"- to make sure it does not slip - often results in over stretched screws or stripped threads - is a "failure", I suspect, as is "under" tightening.
