my passenger side wiper gear skips. if i try to rotate post where wiper arm attaches, it seems to engage but when i run motor i can stop the post from rotating with 2 fingers in either direction and i can feel gears slipping. there does not appear to be any adjustment other than bending the tab in the center of the gold bracket. am i missing something or is it a defective gear? parts are all new. tony didn't you have this problem?