I had trouble too. I didn't like the idea of putting so much side pressure on the snout so I ran to Sears and bought a strap wrench. Then it was a piece of cake. (I haven't used it since) I used the old style torque wrench with no problem. As long as you don't get it too tight; 13 to 15 is fine. (you can't over tighten it because it will break) My stock pulley had less clearance than the Code 3 but I can't remember the measurement. My Code 3 was extremely uneven on the clutch side, something like .010 on one side to .018 on the other. But it works fine, I believe it wore in flat after some usage. I'll measure the clearance this afternoon to be sure where it ended up. It's real easy to be off with the belt and not realize it, double check it. Mine never has slipped, left a black powder or smelled of burning rubber. Mine is installed with no shims. If the belt is off it will become obvious quickly ... at the expense of the belt. It won't hurt the pulley. You might check the belt on all the pulleys, it may be off on any one of them.

Les