Michael,
To answer a couple of your questions,
The Spinnaker pole and rig setup, Greg Goodall made up for me.
Without measuring the wall thickness of the pole I would guess 1.6mm
I don't have a block at the end of the pole we use a nylon block with a hole in the centre for the rope (Standard Goodall Fitting) not rivets required and it doesn’t pull out or jam
The other end of the pole the block is held with the pine that holds the pole onto the beam. This block is a 30mm Harkin high load block simply because I had one. You could use a standard 20mm Ronstan block in the same way.
Regards
Peter