Am moving slowly on this window project. For good or bad, I did open and inspect the motor. No real wear to speak of on the motor or the gear itself.
I cleaned and repacked the gear with multipurpose grease.
There is no second bearing on the motor itself as the shaft is very long and a worm gear which rests in the gear case. The gear case has the second bearing, so when you separate the 2, the armature is pulled against the magnet unsupported.
To remove the motor from the case, I removed the 2 torx screws, and then I gently slid /pried the plastic terminal board from the motor case. The brushes were in great shape as was the commutator. Unless you have real problems, I don't think it's necessary anymore to open it up - so I don't plan on doing the second motor or gear box.
I will permatex the gear box cover and I may install some light duty machine bolts to re-secure the case as the white metal peened pins were destroyed during the process. I had filed their sides to gain access and save meat, but 2 popped right off. No pic of the motor, but I'll throw one up of the gear box (plastic main gear with a metal and rubber insert to drive the reduced gear to the window regulator). I do attach a simple sketch.
