So I am installing a set of Roush UDP's. I am at the install point with the harmonic balancer and am using the OEM installer. The pulley goes on withing an eighth of an inch and all of a sudden the installer falls off. After some inspection, it appears that the threaded end of the installer only grabs a few thread before the shoulder stops further threading. Also, to remove the new pulley, an outside puller is needed as the slots in it are too small for the one that pulled the oem off.The question is, what type of installer should I use? This one fits so deep that it is virtually useless to finish the job.