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Originally Posted by Lil Bandit
...I've inspected it and discovered that the plastic gear that engages the motor worm gear is stripped on one spot. It begs the question why you would actually put a flimsy plastic gear in there instead of something harder.
....can be fixed if you could get the part, but you can't buy the part...
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One thing I have noticed is that the tapered shaft the wiper arm fits onto often slips and the wiper arm ends up wiping paint below the rear window. I think that is what saved mine thus far. Maybe that is part of the fail-safe to prevent the gear from getting damaged! Ya think?
I did tighten the arm down using a split lock washer in an attempt to keep the arm from slipping on the tapered shaft each time I went through the car wash. Those swirling brushes that go down both sides and around the back spin in different directions. They typically try to rip the wiper off the van.
Alternatively, if you knew someone who could turn a new gear on a CNC machine you could make it out of brass stock. As a matter of fact, both the worm gear and the drive gear could be made from the same material.
I'm surprised some offshore company hasn't started to make parts like this.