Here's my overly-complicated method of fixing the cheesy-engineered lumbar support on my 1989 740T wagon.
I held the broken pcs together and used a suitable transfer punch to locate the center of end part. Then glued the broken pcs, using krazy glue or equivalent (cyanoacrylate). Starting with a 65mm long x 9.55mm dia (3/8") alum rod. 55mm of the rod is machined to ~8.8mm, as the inner clearance of plastic threaded part is 9mm. The end thread M8 x 1.25mm is secured with loctite. Once part is tightened down, I drill the 5mm pin hole in head of 3/8" rod. Pics are here
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Big Swede: 1989 745T 250,000KM
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