Changing links for a Casio watch bracelet

Question

HiI'm trying to remove some links for the bracelet of a Casio watch (Marine Gear model). I think the links are joined by screws instead of pins. For each link, there is an arrow at the back of the link pointing to the edge, and I can see a flat s***w head.The s***w head slot is so shallow that I can't unscrew it with a watch screwdriver.Do you have any suggestions?ThanksPeter