BillTodd I looked up you roller nut for your mill conversion when I was wondering what would be a good low cost ballscrew alternative. Are you still using this and if so how is it going?
They're working really well, well enough for me to consider replacing the fixed nuts on my Haighton as well.

As you say, the space requirement is the main drawback. I've been eyeing Mike Everman's quad bearing design and wondering if I could use it with some compact bearings instead of my twin roller type.

Bill