I'm out of town this weekend, but I will check McMaster Carr again when I return home and order the supplies. I looked at a hardware store today, but they only had standard all-thread. I think I'll go with hardened 3/4" Acme all-thread. I'll need to ask a friend to drill the rod ends on his lathe so I can tap them. For the prototype, I'll use S30 front strut thrust bearings. If the tool works as planned, I'll find a similar bearing that I can buy since I only have a few old strut bearings laying around. It sounds like I have at least a few interested "customers". I am not going to charge any more than what it costs to make them. If the first batch customers like the tools, I might make another batch, but to start with, I will just make a few.