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The way it works now (with either brass or oem plastic gears) is that the motor runs until the headlight hits the stop at which point the increased resistance is read and the motor shuts off. No matter what gears you had in there, dead stop = motor shuts off.
But....good thinking
Thanks for the info, I didn't know the motor shut down with the increased resistance.
Thank you to everybody who gave me advice on this job. I just finished replacing the headlight gear motor with a new brass one this morning. It seems to work fine now. I found two broken teeth on the plastic gear and the sheared off teeth were stuck in the grease around the worm. If you follow the directions supplied by patches on this thread this is a very doable task. Thanks again.