In the box where I keep the change wheels for my mini-lathe, I recently found a handful of square nuts. I think they're imperial sized, 3/8" square x 1/8" thick with a thread size that I have no way of measuring.
I'm fairly sure they are related to the lathe in some way but the big question is – what are they for?
I think I can feel a 'Doh!" moment coming soon….
Brian