The spring loaded nuts cost a bomb here in Australia so I ended up making them out of some 1/4" thick flat stock. the spring is not necessary because the angle iron cross pieces are rarely if ever removed from the rails.
Since I made my mill I've stumbled across a heap of 14 gauge including the nuts and one of the fellas at the tree loppers yard backed a forklift into one of my sets of mill rails twisting one side of the rials quite badly. I use pieces of unistrut often in my home shop especially for things like jigs and prototyping. Also
This is a CO2 cylinder holder I made from 14 gauge that allows the cylinder to be easily inverted for decanting the CO2 into smaller CO2 cylinders for soda makers.
Here's another use of the HD stuff.
Since I made my mill I've stumbled across a heap of 14 gauge including the nuts and one of the fellas at the tree loppers yard backed a forklift into one of my sets of mill rails twisting one side of the rials quite badly. I use pieces of unistrut often in my home shop especially for things like jigs and prototyping. Also
This is a CO2 cylinder holder I made from 14 gauge that allows the cylinder to be easily inverted for decanting the CO2 into smaller CO2 cylinders for soda makers.
Here's another use of the HD stuff.