Revolving Tail Stock Chuck or Rotating Tail Stock Chuck

[Frank S]

Yes, one thing one learns quickly in the model engine building undertaking is...

NEVER REMOVE THE PART FROM THE PARENT STOCK UNTIL IT IS ABSOLUTELY NECESSARY TO DO SO.

Leaving yourself something to hang onto is essential. Model engineers should scratch the above on the inside of their safety glasses lenses.

Marv the same holds true for a lot of things even in the larger scale. and especially when dealing with things like spool valves for hydraulic manifolds and such.
I had my own propitiatory valving that I used on the elevators I used to build. Later I went to poppet style cartridge valves but I made my own manifold bodies creating creating the dozen cavities on a pure mechanical very old Bridgeport without any DRO was laborious, it was much easier to do tool changes and complete 1 cavity at a time than it was to do all of 1 process then the next until the cavity was formed. the last step was a special ground burnishing tool for each size cavity