Joss West Cue
The only joints Stroud used when he had the J with a sideways W which this sounds like were a piloted 5/16 x 14 Acme thread (which will not fit a regular 5/16 x 14 shaft) and a piloted 5/16 x 18 like Meucci used. That said, all his shafts that I have owned were all linen phenolic...