My son and I just installed the underdrive pulley kit. ( 1999 SVT Cobra Mustang 4.6 ) We followed the instructions exactly. We used a harmonic balancer install tool. It seemed fine at initial startup. But, when he went out later that night, he heard a squealing noise. We tightened the balancer pulley all the way to the timing cover. But now it has a wobble to it. Any suggestions ?