I have two JossWest shafts that are threaded 5/16 x 18.
1. 29 inches, 3.8 ounces, 12.4 mm. Rolls nice on table. This shaft was original to an old sideways W cue.
2. 28.5 inches, 3.5 ounces, 12.6 mm. Rolls excellent on table. This shaft was made later by Stroud.
I sold the cue these went...