I actually did make a feed screw. It was a 1/4"-20 RGU feed screw, approx. M6x1. It was far too flimsy. I knew it had worked for Dean over on http://www.deansphotographica.com/machining/projects/projects.html (look under "feed screw for the Taig lathe") but I found it very wobbly. So I needed a bigger screw. I am limited by ready availability, so maybe M10x1 would do it. Not for sale at Home Depot. Maybe 3/8"-16? This is about M10x0.75. But, here comes the problem, I cannot get a 3/8 screw through the bore of a Taig, so ... we need a steady rest. I made one before, see label "steadyrest", but it is too flimsy, just like the 6mm feedscrew.
I had used a wood-turning attachment as the base of the old steady. It worked. But not really steady enough for what I want. So first I have to make the slide. This is a 45 degree dovetail slide, about 7mm on perpendiculars. So I set out to make the slide.
I had some 1/2" (12+mm) steel so I traced the outline of the old slide onto the new stock. Then I had to mill it out. And now we come to making C. I wanted to use my new Christmas present, a 4mm endmill. The bigger the endmill, the less work. But Cecil B. de Mille cannot chuck a 4mm bit.The biggest chuck is 3.2 mm or 1/8" RGU.
The next job is to cut the 45 deg slots for the dovetail. The big boys use dovetail cutters. I haven't one; and it would never fit in my mill anyway, so we improvise. Using a protractor we tilt the piece to 45 deg and mill straight down.