[IMG]
Photo may be useful to you. You will need two screwdrivers as one screw end seems to be part of the long tube like ‘bolt’ (or its very well). Second is the small screw. The long bolt passes through the steel tube that fits into the resin watch case lugs and is then secured by the small screw. Without a second screwdriver, the whole assembly just rotates. Looking at this, the good thing is that the assembly is much, much stronger than those spring loaded pins that are used in many watches. It would take a lot of force to break the strap off of this!
Hope that helps.