A long time ago I had a mate who had one and he got the design for the gearbox from a magazine and cut all the gears, cast the housings , made several of them in his lunchtime, before and after work where we both worked me in a central outfit doing Electrical Maintenance he was in a former life an owner of a motor rewinding business. He was employed adjacent to a well equipped metal workshop in another division from me.
Why I mention this is because there are sure to be Myford oriented groups on the net when trawled will reveal the gear sizes etc my mate knew them all from his memory his Myford was at his home. Unfortunately I learned last week he is in a care situation with advanced alzeimers. Ces la vie. The lathes were small and well made enabling so many people to have and operate there own.
Trust you win this challenge.
Kind regards Peter.