I also have been tinkering with the wiper motor this week. Ever since I was a little kid I have had a problem with having to take things apart to see how it was put together. As an adult in my mid 30's I am still just as bad.
Over all it was not too hard to get apart. The hardest part was getting the staked motor cover off But it was a waste of time. There is a bronze bushing with a plate welded over it so it can't be removed for plating. It came off pretty easy after I spend time trying things that didn't work. What did work is clamping around the magnetic body with a chain vice grip wrench and clamping the wrench in a vice. I then used a rubber strap wrench to turn the cap when pulling outward and it spun off after getting it going.
Still waiting on some plating to finish but got the hard part done today.
Cleaned everything real good in the parts washer and blasted the aluminum with walnut shells. I painted the motor cover and put the main housing back on the the motor and cover. I then resoldered the motor wires I had disconnected. The hardest part came next. No matter how hard I tried I could not get the mail shaft, white gear and the drive plate down far enough to seat the snap ring. After some head scratching I decided to sacrifice a socket by making a window. It worked perfect pressing it with a c-clamp and was back together in seconds when I did that.