Thx Winfred for the Window lift suggestion
You were right about the plastic parts. One was shot. Put two new ones in and carefully lubed up the mechanism with some waterproof marine grease.
Also discovered that you can adjust the stablizer bar that stablizes the "scissor joint" to the door frame. Put a bit more tension in that and *wallah* - good as new.
Shot some silicon slip spray on the tracks for good measure.
Bet it'll be good for another 15 years.
thx
Jeff
Bellevue WA
90 535iM - not much stock remains. 3.7 liters, ported head, cammed, 3.73 diffy, M5 brakes, MAFed, yadda yadda yadda
86 Porsche 951 - Track Toy