I actually just installed it two days ago. The install went pretty easily and I actually didnt end up using the 1 spacer that was provided to me. I checked the tolerances with the stock spacer on there and it seemed to be .32mm which is a little above but close enough to the tolerances Cod3 suggested. I'm not too car savy or tool savy ha so I want to make sure that I'm correct on this one, how would i know if I actually needed that spacer. I thought i measured the tolerances correctly but there was some confusion during that process, i'll choose not to explain hah, and also the Code3 pulley seemed to be crafted a little uneven, as when i hand turned the pulley I could see that the tolerances, at least the tolerances on the edge of the pulley, change. It just concerns me that your guys pulley came with 3 spacers and most of you used them all and mine came with 1 spacer and I didnt even use it. What are the tell tale signs that my tolerances are too low? Anything I should watch out for? Oh and the first ride my belt slipped twice but after that the tensioner must have adjusted becasue I havent had a problem yet that I can see.