Originally Posted by
Europa01
The stop pin faces are convex and the stop pad faces are concave giving a spherical seating. A cable tie would be essentially in tension to keep the pins & pads engagaed. If that is a cable tie in the photo then you can see the horrible attraction of using one (or two) to hold the door / plug in place before fitting the locking bolts.
I am not convinced about the convex/concave shape of the stops. Whilst it does look a bit like that in the photo you posted, it might just be the reflection that makes it look that way. In this photo, the contact surface looks flat. There is no distortion in the reflection that you might expect if the surface is not flat (other than at the very edges).
