well there really shouldn't be much of a problem then, other than the taper,shank, isn't all burred up. Just put a board on the front of it and give it a good whack with a hammer. When you slid the chuck into the head and it gets snug are you able to wiggle it around, a little play in it, or does it seem tight? I have seen once in a blue moon, some chucks have a tang, taper, too long sometimes and the end of it bottoms out on the depth of the female hole. Good for some things but not in this situation. Not being there it is hard to tell but do you feel like it is hitting something before it settles into the taper. That is about all I could think it would be. Crappy precision, bottoming out in female bore, burr's on either the male or female, or not seating it good enough, hammer time. Good luck and let us know how you do.
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