had a issue with the rear door handle not being able to open the rear door, so pulled it apart today and replaced the plastic pivot pin with a 8mm bolt, as the plastic pin was loose in its hole and flopping around, I welded that to the panel and used a nylock to retain the lever arm, put it all back together and decided the locking mech could do with the same treatment, the locking is alot more positive, the central locking system locks everytime now, and the rear handle is better as well, no pics but may see if i can get some tomorrow.

Pedronz

 

I'm having s similar issue. I'd appreciate a photo or two. Good solution