3 drahthaars,
The "screw slots on both sides" are in covers for the hingepin, not the hinge pin itself. The covers might also have locking screws to hold it. The covers and locking screws must go back in the same places or the engraving won't match that on the receiver. More than likely, it will be necessary to grind special screwdrivers for the covers and for the locking screws. The slots may very well be "V" slots rather than "square" slots. It will pay to examine them with magnification, to be sure.
Mike
