14 year old car and 5 year old daughter who loves opening and closing windows means broken rear window regulator. The metal part that holds the cable crimp in place has bent open at the top end, which seems to be a common failure for the E39.

I've just used JB-Weld to epoxy glue the cable and crimp to the window lifting metal so in the morning I'll see if the JB-Weld is as strong as it says it is. It is good for repairing cracked bumpers though.

Does anyone know if the sliding window lifter is removeable from the regulator mechanism? I haven't removed the regulator from the door but I'm assuming you can slide it off perhaps the top end.