Thanks guys. The first one was a tool I needed to thread the breech on my cannon barrel. I do like making tools. the tool companies help me see things when they print good pictures. I then build one to suit myself with "improvements" to better deal with my specific needs. I think some of my changes are things the original maker should include in their tools.
The big solid one is used quite often for large sleeves a local companies shaved apes foul up that has internal threads. I won't name to company but to say they are a world wide outfit and it is a big feather to have a vendor number with them. You can't buy a number! They want you to have it, hopefully because of your good work. I've been a vendor for 20+ years with them.
The rollers on the big one need to be redone to make them square with the imaginary cylinder. I missed them by a "skoch" when I made them. It seems like I remember being in a hurry, so now I get to redo them. Hopefully with a great deal more care in making everything true and square.
Ulma Dr. is right, Rockwell stuff is scarcer than chicken lips. I did buy a spare set of belts for the speed adjuster portion just because they are "odd ducks". I'm in the middle of the oilfields and we have a plethora of supply stores, so I went to a friends place and we researched the belts. They came from to different places complete with a few years of dust attached. I'm just glad to have them for when the ones I'm running now go "poof".