Please note: This post contains erroneous information. I have decided against removing the post because I am basically narcissistic and think that I have something to offer by keeping this up and explaining in a future post what the real problem is. If you skip this post and go to the next one, the story won't be complete without reading this one. Suit yourself.
I finished re-wiring the motor leads to the 201-2 from 1940. I installed the motor and fired it up. What a racket. The machine stitches very nicely none the less. The machine would zip along and then screech/groan, slow down and then pick up again. I wondered if I had missed a spot with the oil and the grease.
I removed the handwheel and just ran the motor. Same thing and this time I could see the worm slow right down. I knew it was a motor problem and I was pretty sure what the problem was.
Look at the photo. Look in the red circle. There you see two wires that are unlike any of the other wires coming out of the windings and connecting to the commutator. I have never seen any armature like this. Every other one has those fuzzy thick wires winding out from the coil and onto the commutator. I wondered about this when I took the motor apart. The inside of the motor was a terrible mess with lots of debris and carbon. The brush springs actually had grease in them and the grease looked oily. I wonder if someone oiled this motor? I am certain that these wires are supposed to be fuzzy like all of the others.
I did re-wire the foot controller as well. I did not solder the little wire rings. I am tired. The machine is as tired as I am. The decals are worn, there are many chips on the front of the bed, there are scratches and the clear coat is gone. But the machine works and it sews very nicely. It doesn't have to be pretty. I am in love.
UPDATE: This was NOT the problem. Go to the next post.