Here's a decent schematic of the clasp, it looks to me that the lug which holds the pins (5,6) has sheared off rather than the pin it's self. Having just had a quick look at mine these lugs look like they are soldered, welded, fused somehow ??? onto the main part of the clasp (1) even though the schematic doesn't show the lugs as a separate parts. Never really had a close look before.
