Re: 1936 Johnson A-80 gear backlash hub

[Mumbles]

Do you have a small boring bar which can hold a cutting bit at a 45° angle on one end? If so, you’ll want to grind the bit to the necessary angles needed to cut the thread close to the bottom of the bore. You really have to pay attention and do your math here as you don’t want to run the bit into the bottom of the bore under power! Guaranteed to ruin your day! 😀