Can't offer much advice on reinstallation of the trunk torsion springs. Last installation was on 2002, and for did not seem much of a problem, but maybe luck had something to do with it. Curiously, I recall someone who struggled with similar torsion and became so frustrated that he adapted hinges and springs from his parts bin. I can't remember what they were from but they looked something like this:
On a semi-related note, I was recently asked about the physical differences between the trunk hinges used on the E3 versus those on for the E9. I'm certain they are different and carry different part numbers.
Reason for the question? The owner's body shop couldn't align the trunk lid. I suggested that the problem could be with the hinge adjustment. Now it turns out the two already painted hinges are not the same. I suspect one is from the E3 and
maybe the other is from an E9, although it could be from another BMW. Owner does not know which one is which.
Anyone have any images of the two hinges back to back? Are there other hinges that might be interchangeable or easily made to work?