The link pins are glued in with cyanoacrylate, I think. It is more than locktite. I got 2 screws out couldn't do the rest, took it to 2 jewellers who failed and messed up the screw heads. Eventually took it to a manufacturing jeweller who heated the screws up and managed to loosen them and adjust the band. Seems like you need a 1.5 mm flat head screw driver and a soldering iron applied directly to the screw. I will now put some blue Loctite on them.
Is there a way to get replacement link pins as the heads on the 4 that have come out are unserviceable?