this camera's two AA batteries over time had worn away the clasp that held the door closed. amongst other things i tried making a new clasp by heat welding a plastic strip from an id card into the door. it was kind of like a mortise and tenon joint but failed due to forces from the batteries wanting to push out.
so i came up with a longer strip that i could buckle under the camera strap mount.
anyway the pictures will speak their thousand words and explain more clearly!