Whenever I take one of these windows apart I usually find the motor is seized wedged in the shut position. There is a locknut at the end of the motor shaft with a slotted screw to adjust the end play in the motor shaft. I have found that if you loosen the locknut and slotted screw you can frequently get the motor to start turning by alternatly applying power in one direction then the other. A bit of WD40 or whatever helps to free things up as well. I haven't noticed the "ötter" bit in there but will look for it in the few motors which I have not been able to othewise repair. Cheers Dan

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It's always something simple
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