[Al Skierkiewicz]

JK,
There is a temperature sensitive cutout as I remember. (It is designed to prevent motor failure when a window is frozen.) You may not modify the motor case and doing so would only mask the real problem. You will find if you look at the problem that different motor power is needed throughout the rotation of the arm. At some points the power needed is small and at others it is quite large. Surgical tubing or other counter weight is an excellent way to quickly fix the problem. Just be sure to beef up the rotating joint to take the extra forces of the counterweight and arm.