Colchester Master 6.5 Leadscrew Removal (Round Head)

[Gaffer]

The leadscrew has beaten me. Youtube videos and the various posts in this section haven't helped me either. I'm hoping you can shed light on the errors of my ways. I have removed all circlips and grub screws. I've pried, tapped, and cussed a lot, but it won't budge. Something has it captured. I have a similar issue with the drive shaft, but I eventually got it. I'd like to remove the other shafts and gears. Still, my brain isn't big enough to figure it out, at least without breaking anything. I appreciate your help.
Here are some photos where my progress stopped:

 

[matthewsx]

Taper pin?

 

[Gaffer]

Taper pin?

Not that I can see and it isn’t on the diagram.

 

[Gaffer]

I got it out the other. I used a 1/2” piece of aluminum rod and drove it out. Started slowly and when she moved a little, I kept going ensuring no gears were binding. There was way too much resistance compared to seeing others pulling theirs by hand. This weekend I’ll cleans and inspect all the pieces. I’m hoping nothing is bent and it was just gunked up. A quick visual didn’t show any obvious damage.