Klaus, I'll try to get a photo of it that shows the damage in an understandable way - the damage is in an area few have likely actually seen. Basically, the internal hex lug on the top latch, where you manually lock/unlock the top, seems to have stripped out on the previous owner. He has welded a hex nut (11mm flats) on top of the hex opening, so the mechanism is now worked with an 11mm socket. This, I think, was the death knoll for this rotating pin. I think the heat treatment was 'fried' by the heat from welding. The current damage is at the end of the rotating pin. The round shaft changes to a square drive and the square end has sheered off flush. The square drive engages to work one of the locking pawls within the latch - only mine does not now. I can't see that a rebuild of the latch is possible or likely, so it looks like I need to source a replacement passenger side latch. Real shame too as it looks like it was manufactured yesterday, aside from the PO's dinking.
Herb