I finished my disc brake conversion, but I can't get the very very last piece to fit! The darn little dust caps that go over wheels bearings. They just don't fit! should they be this difficult? I've tried heating tmy rotors a little as best I could but it was dead of winter in an unheated garage last time I tried. The instructiongs say "tap in with hamme" well there aint no way these things are "tapping" in.