It's hard to get enough torque with the little screwdriver to do much damage to the screws... but you could..
Rolex uses loctite to prevent them backing out...(as mentioned), but it is seldom necessary..
they should be tight, but not forced.....they need to be more than "snug" and there is no way to visually know..
For a bolt to properly stretch and lock itself in place, there are recommended torques... That little 1/8 inch bolt in the bracelet would likely only need about 3 ft lbs and result in 900 lbs of clamping force......... But, since it's not really clamping anything (the holes go straight through and the pin floats), then all you are doing by forcing it too much is stretching the threads apart, stressing them..
Having said all that, and recognizing that the bolt does not actually clamp the bracelet together...it just rides there as a hinge pin, the only thing holding it is the threaded portion - loctite is the sensible solution..
OK...well..never mind..nobody really cares, so screw away....
