Removal of original steering wheel - help

[chook]

I could use some help in trying to remove the existing steering wheel on my 71 Cheyenne truck. I want to replace it with an after market wheel. I have removed the nut and washer that retains the wheel and have had a 3 jaw puller set up on the wheel trying to dislodge it. I have had some considerable weight on her and have tapped the pullers center bolt to try and jar it loose off the spline, but to no avail. Has anybody else had similar problems? Is there something I'm missing. Is there some sort of hidden grub screw or something else that is preventing this wheel from coming loose?
Any help would be appreciated