prop install problem

[softailcowboy]

has anyone had any problems installing a replacement prop that was the same as original. I pulled my old prop (bent) with a puller no problem. tried to install replacement prop but it won't go on far enough to get nut on. the prop shaft splines are clean have no burrs aren't bent look good. but prop won't go over splines on shaft? prop shaft not bent everything looks good. tried rubber mallet to help........no avail...... stumped