On Fri, 08 May 2015 14:25:23 -0400
woodchucker wrote:

So there is the mt taper for going into the spindle,
and then they is usually but not always a J taper or sometimes other
tape for the MT arbor to the chuck.

you were correct about the J taper it looked like MT3 but
regardless I got that free from the chuck as there was a hole in the
top of the chuck and it was easy to use a punch inside the chuck jaws


my next step was to dismantle the chuck
i bored a hole in a 2x4 and tried to press the piece apart but the
2x4 wasn't hard enough and did not survive so i need to try some
harder wood

found some good instructions albeit conflicting about whether or
not jaws should be closed or half way, etc.

i tried the half way suggestion