Anyone have experience with the pully kit from barns? I bought it unused from a guy that sold his Dog before he could install it. It came with a shorter belt and it is stretching a lot! put less than 30 miles on it and has to be adjusted a 2nd time, are these good belts? It certainly looks less durable. It jumps teeth in first and second gear on hard acceleration. Has about 1 inch of play in it and I'm understanding it should be 1/2 inch? Any help would be appreciated.