I was given one once and had to winch it onto the trailer it was locked up so badly, looked to me like there were about $500 worth of just chains and bearings to replace just to get it to move by pushing it so I traded it for a 16 gauge shotgun which was a good trade. My mind was blown to see what it takes to make one work just in engineering, some sort of planetary gear transmission and what seemed like 150 foot of #41 chain. The guy who traded me never did anything with it and his wife donated it to the first organization that called, he said it was a great relief to be rid of it and bought the shotgun back for $75. His wife will not let us do business any more now though, he sneaks over and buys stuff still despite her warnings.:laugh: