It has been a while since I have done any work on the head, as I have been OS and interstate for work. One thing I forgot to strip down was the quill (partly because it was wrapped up in a rag for protection and was effectively hidden from sight!).

I had been in contact with a guy from QLD who had many years of servicing these machines and he believes he has some bearings (amongst other parts) in his collection. He is travelling at the moment, so I will have to wait. No big deal, as I have a ton of other things to do.

First thing was to make a wrench to remove the nut. Whilst it took about 15 minutes to make, it is a much better option than the PO chose - as is evidenced by the damage to the nut. Please don't attack nuts with punches or chisels (unless it is your last resort).
   

All the bits once they were freed from the quill.
   

Cleaned up and ready for new bearings.
   

A close up of the damage done to the nut
   

I also filed the casting on the worm gear cradle, as It didn't mate with the engage/disengage crank sleeve. It took about three attempts to get it to move smoothly. This is one area where things must have changed over the years, as some of the components don't fit. The pin the engages the cam to move the worm gear cradle in/out didn't fit the shaft of the crank and had to be turned down. The crank handle hole is too small for the shaft and will need resizing. All other components have fitted together nicely thus far but I won't know for sure, as I cannot actually fit them into the head until the quill goes back in.

The worm cradle in position.