Need to tighten that loose fan Belt? don't use a screwdriver to hold the pulley - get the correct tool for the job! Keep in mind that correct fan belt attachment is essential to keep your engine running cool. It is nearly impossible to obtain the correct tension on the fan belt pulley without this tool. Before you purchase one from us though, make sure that you check the factory tool kit that came with the car - there should be one in there. Important Tip: The pulley and fan belt must use six shims at all times, either on the inside or the outside. Make sure that you place the extra shims on the outside. If you don't, then the nut will bottom out and the fan belt will not tighten properly, no matter how hard you try.