I had to order some emergency collets for this. My 3/8" plastic rod is actually .3773". That is within it's rated tolerances though. That is too tight in a 3/8" without even being loaded up. That may have been why I was having trouble with the 5/8" brass as well. It was fairly tight. I might be able to get the E collets to be sized where the par puller will work reliably without a groove. I am going to mike all my stock and see what I have. E collets will be good to have on hand anyway. I let this all ride for awhile Because of Mr. Jackson's passing. He will be missed.
I was also able to figure out that the 15L wants Gcode in diameter mode. I did get Dolphin to work and output code that did not get any errors.
It just will not run it right yet.
Still working on it.