Harrison M300 lathe - feed gearbox removal

With parts diagrams but no maintenance manual, I blunder my way to removing the threading/feed gearbox from my Harrison M300 lathe. I tried to do the minimum necessary to get the gearbox off. Slight swearing.

Fixitnige had met and solved the problem with the 8-position knob sticking in 2016:
Harrison M300 Refurb and Repair