Hello, I am changing my belt on my 2000 GTP supercharger, I get the belt on no problem,start the motor and smoke coming from the belt, started looking and it appears the smallest pulley towards the front isn't spinning. I pulled it off and it looks like it has bearings in it, I am assuming it has gone bad. I was wondering what this is called so I can hopefully go pick one up from the parts store? Any insight would be appreciated. Thanks