I'm trying to dismantle my snowblower to straighten some metal and take care of some rust, but having a bit of trouble removing the center drive shaft to the gearbox (the one the impeller/auger spins with). It looks like there are 2 set screws on the back of the housing holding the gear onto the shaft, and one more on the spacer behind the gear. Is there anything else holding it in place? I can't get anything to break free that would allow me to slide the whole thing out the front.