Chuck,
After posting the last one I went and starting making a arbor from 3/4" dia. CR and went to my tool box for a die to thread the end and I found 2 arbors like the one I was making just 7/8" dia. I made them back in the mid 90's for a machine of mine that I was altering, but it would not be called a arbor, just looks like one. Forgot I made them and now I have 3. I keep finding things I made on a lathe 40 plus years later, I just forget that I have them and did not use them for a long time, but do remember when I made them once I see them and why I made it in the first place most of the time.
Paul