Passenger side power window issue

[naisugai]

So over the weekend I replaced my passenger side window motor, but when I hooked power backup I could hear the motor turning on, but the window didnt move. I pulled the window regulator out and tested the window switch and had power, I also pulled the regulator at of the door and moved the glass up and down with no problems. Could it be possible that the window regulator arm might be bent? I noticed also that I had to force the top right stud (of the four bolts that hold the regulator in place) into the hole...so something is weird with the regulator. Any thoughts?

In pricing a window regulator I noticed that the majority were sold without the motor attached. If I were to buy just the regulator, how would I know where to install the motor at on the teeth???

1986 Chevy C10