I recently had the opportunity to pick up a give away 1963 Snow Bird model 242. Was expecting a non running machine to tinker with but instead got a machine that starts on the first pull and may need nothing but a shear bolt. "My Dad bought this new in 1963, here's all the manuals." I was shocked. Does anyone know a good, available / equivalent, replacement for the shear bolt? Also, can anyone tell me if the wheels are supposed to rotate independently, as in opposite directions when turning around? Or do these operate in straight lines only? Wasn't exactly expecting modern features but seems nuts that I throw it in gear and it just takes in a straight line till pulled back into neutral.