prothane polyurethane torsion bar dust boot problems

Has anyone tried to install a set of these polyurethane dust boots onto their torsion bars? I cannot for the life of me push it over the head of the bar. I have tried lube, heat, and press. None have worked. I actually injured my bicep cause i was pushing them so hard. I am about ready to give up and just go with the regular dust boots, but again, I'll be waiting on shipping. Any ideas will help.