Thanks, it's a late 74 car. Earlyish for UK, you might call it late [emoji849]
TBH I think your door looks similar to mine - folded apart from that last inch or two.
But maybe how it's attached is a red herring. Maybe it's just where twisting forces on the door show.

@Patcon:  I wasn't able to find the thread by searching.  Could you help with a link or search string, etc?  Thanks!

  On 4/30/2019 at 2:37 PM, Jughead said:

@Patcon:  I wasn't able to find the thread by searching.  Could you help with a link or search string, etc?  Thanks!

Lily thread?