Originally Posted by
Loose rivets
Flynerd You're looking straight at the locking bolt, end on. I'd imagine the centre hole is a machine turning indent, though I'm surprised it's there at all.
The length of that roller pin is still worrying me. Given that the door can move forward/aft a tad, the locking bolt is very near the end edge of that roller pin.
Yup! Tthe guide roller on at least the side shown in photos was not long enough to reliably engage the door. The four bolts really do nothing to secure the door , rather prevent movement of the mechanism.