I was hoping to buy these but they are a weird size. The machine came with a couple of hacked up ones, and 3 different sized bolts as well to add to the mix.
A piece of 1/2×3/4 steel was cut to just over 3” length. This gives me 4 nuts 3/4” long and 0.025” for 3 saw cuts.
Some careful markup on the metal provided the guides I needed to make this the correct size. Measuring at close stages resulted in a symmetrical part. A bit of careful work with a centre punch meant that the bolt holes were centered in the slot. I tapped these 5/16×18 for a set of studs and standoffs that I hope to buy later this year. This is the first time that I used power tapping, what a joy compared to using a tap handle. A blip or two on the drill press power switch does the job. Only works for through holes though.
This was the first real test of my milling machine and my skills. The result is quite decent. And lots learned about the machine and its capabilities.