well, i thought i would update all here. I bit the bullet and bought 2 of the brass folding mirror gears and new motors w/gears from GruvenParts
installed a few weeks ago and have been using the hell out of my folding mirrors (2x per day every day, sometimes more). Works like a charm.
Its a good fix, no point in buying whole new mirror. its just that stupid plastic little gear thats all the problem.
I just ordered a rebuilt motor with brass gear already in it off ebay for $175, one year warranty. Looked at your option and didn't want to tackle the gear part and possibly have no mirror. I will take the old one apart and see if I can do the gear swap easily enough after I change out the motor.
Just to update I was done in about 1/2 hour swapping out drivers motor, works great, will take apart old motor when I get a chance and see how difficult it will be to replace stock gear with brass unit.