All, I have a 1450 with a QA42 snowthrower attachment. When the snow is too deep for the blade I use the snowthrower. The problem is that I use it on a 1/3 mile dirt road covered with 2B stone. Most of the time when a stone goes through the thrower it just throws the stone, however, once it bound up the auger and stopped the engine while the engine was running full throttle. Is there a way to modify the thrower's drive train to incorporate a sheer pin to eliminate the possibilty of damaging the engine? I have had skids made for the thrower that keep the body of the thrower approximately 2 inches off of the road but it still takes in the occasional stone. Also, does anybody know where to get the best price on tire chains for 23 X 10.5 with cross links every 2 links with "v-bars" (similar to a 1/2 chain link) welded to the cross links for additional traction?