For 5/16" X 14 and 5/16" X 18 Threaded Caps,
I use Altas' Threaded Brass Inserts..
They do not fit Schon, Bill McDaniel or Micheal Vollmer Cues.. I would have to Tap them out.
But, it's the screw it's self that is slightly oversize, either the Pitch or Nominal Diameter.
There are other cuemakers that have the 5/16"
size Joint Screws, But, I do not know if they will fit the standard stocking Brass Inserts that Atlas sells.
I am not responsible...

I posted a few photos of the event at WWW.billiardcommunity.com for everyone to see.

The event is in China so does anyone know the main website link?

.. to my Cue Caps Blog...
I will be posting Cue Cap's News and Technical Notes about Joint Protectors..
Thanks for stopping by....

I believe it may be Adams, 1970 edition. It is in fair shape and needs a ferule.