The heat helps, but after you tighten the arms of the puller very tight on the lug studs & also tighten the center pin of the puller against the axle, Dont' be afraid to give the head of the puller a couple of good wacks with a baby sledge. I was reluctant to do this for a long time, then a retired Chrysler told me "you could get real frustrated or wise up & HIT IT!." I did & it works. Once you get it off, clean the inside of the hub & the tapered shaft of the axle, grease the shaft before you re-install. Good Luck Torry 56 Nassau 60 Adventurer 68 Newport