I'm aware that there is a technical wiki regarding doing up the two screws that hold the backrest on , so started to dismantle the seat only to find:
This really is a spindly little piece of metal for what it is being asked to do. I'm amazed it has stood up to 20 years of fatigue, particularly in a 2-door where the seat gets tipped fairly regularly
Certainly doesn't look like the sort of over-engineering we are led to believe was built into German cars of this era
(I'm not asking for technical help, as I have a spare and have already rebuilt the seat - just bringing it to your attention!)
