Quote Originally Posted by i2i View Post
you can buy couplers with different sized ends, if the ballscrew has a turned diameter already.
Sounds like it's threaded rod not ballscrew. Either way I could do it, but I'm quite far away...could post it I suppose. Probably cheaper for me to buy the threaded rod (about £5/m for M10 stainless), machine it and post.

Normally I'd advise against threaded rod as the efficiency and accuracy is not great, unless you use the angled bearing as a nut method that I started off with. However I doubt it matters much for a foam cutter.