I have a simplicity 3415s with a snowblower. I'm having 3 problems with it. First is after running awhile in the cold the throtle stops working. When you move it the engine does not slow down. The manual for the blower shows some shields for the carb and linkage but the picture is not good enough for me to make them. Second problem is the belt that drives it. It is coming off the front pully, the one that is attached to the chain drive. Even with the guide in place it has come off serveral times. Third problem is with the rod that sets the direct. There is susposed to be some kind of shim material to stop it from moving on it own. It goes inside a bracket about 1/2 way up the shaft. Any idea what it should be made of so that ice doesn't freeze it up. I moved to WI from south Texas and really don't have a lot of experience with all this white stuff. Thanks