Newbie with Churchill cub

[Dr Stan]

I do not know if you have access to Boston Gear or maybe a similar company. You could purchase gear blanks then bore them to the required inside diameter. If you are hesitant to cut the keyway it is not difficult to do as I learned how to cut internal keyways in the US Navy's machining school. Take a look at this: https://www.youtube.com/watch?v=XcU0LTavzDM Keep your boring bar as short as possible to reduce spring in the boring bar. It's a good way to cut keyways if you do not have a broach set or shaper.