Sounds promising, I'd probably only need to lengthen the ends a bit, maybe deepen the circlip groove a tadge. A couple of flat spots would be handy.

Can I find the dimensions and details for the double nuts on your website? They seem to be hidden under pre-machined screws, so when you click for info you get told about end machining rather than nuts :confused:

Last time I bought a "zero backlash nut" it was from that other bunch. Turned out I had to crush it sideways. A bit tricky when it's buried under a milling table