Originally Posted by
walkerwek1958
Apply heat to the area where the thread enters the link, if it’s like Rolex this is the opposite end to the head. This is essential to soften any threadlock. Immediately after try turning the screw with a screwdriver, applying pressure to try and tease the screw around. If this doesn’t work try again. Heating the end then applying plus gas or similar can sometimes work, it’ll smoke a bit so do it in a ventilated area.
A combination of heat and penetrating oil, together with a carefully applied screwdriver, should get it out. I don’t recommend trying to drill it unless you have the skill to do so, this is a very tricky job requiring a pillar drill and a good stock of drill bits.