I have an MTD 8hp 26" snow blower that was purchased about ten years ago. During the last snow, I lodged a small rock in the blades and of course it sheared the pin, which I replaced but after that, it would not move. I took the plastic cover off on top and seen there was a small belt just hanging there. I took the bottom plate off and a silver pulley fell out. I am assuming the belt attached to this pulley and then there is a friction pulley that goes against that one which turns the wheels. Two questions - How does that big silver pulley attach - I can see there is a bolt hole and the pulley has a bolt sticking out of it but this has to attach in some other manner, I would think? Also, can a person get another one of those friction wheels since the rubber looks pretty shot on this one. I have no idea where my manual went - some where in a box somewhere so any names for the pulleys and what to do with them would be appreciated. Thank you.