routercnc - Haha yeah it does go rather nicely doesn't it! Happy accident!

Yeah it has occurred to me that certain jobs are much quicker and easier to do manually, but I think threading and complex shapes like balls/curves are certainly going to be easier on a cnc'd version, especially for someone of questionable skill such as myself... Ideally I would be able to use it both manually and automatically, which I suppose should be possible with a nice pendant. Definitely intend to use it manually for the foreseeable though so we shall see how things go.

Desertboy - In theory, the bore is 20mm so it can certainly physically accept a 16mm ball screw for machining. I believe machining them is a bit of an art though. Probably somewhat depends on the screw and how hardened it is. I think everything I have seen suggests that you need to grind off the case hardening before trying to end machine them.