Great looking tools and I have a bit of additional advice to make them better to avoid snags on the set screws.
My first set of tools was the same design, but since then, I was informed of 3/16" diameter tool steel. The same idea except the tool steel is silver soldered into the ends. I'm not sure where it can be purchased in the USA, but I know it is available in different diameters.
These were my first set of tools.
Since then I have gone to solid tooling without the need for HSS cutters. Being from the farm and knowing how hard metals can be, I had these tools formed by a local blacksmith to meet my design. The only cost was for the blacksmith's time and that was $40 per tool. The tools are not round like most hollowing tools, there is a flat edge which rests on the tool rest. I find that the flat profile gives me a better idea of what position the cutter is in at all times. If I want to tilt or roll the tool at any time, it is easy enough to do so. The material is
plow shear and it is hard! I had to do a lot of filing and sanding to get them as good as I did. The handles are designed on a concept that I saw in one of David Ellesworth's videos.
Here's the tool in action.
I don't mean to hijack the thread, I just thought this would make a great addition to it.
Dave