After cleaning up the door lock mechanisms for re-assembly I found the problem with my sticking RHS door. The lock cam is worn out and I need a whole new assembly. So if anyone has a good working second hand drivers side door lock mechanism for a 72 S and wouldn't mind posting it to Bris, please let me know. Cheers!
bump.
I have a couple if you are still looking for one.
Yogie
Thanks Yogie. I think I may be sorted.