I don't know if this will help you ;
My Crossley shuttles are 15 inches long and are marked Crossley's England, 122, 6/86. The tensioner is bronze metal, the tensioners are 2 and 1/4 ounces in weight each and adjustable with an Allen wrench.
The shuttle cavity is partially open, the ends of the shuttles are shaped wood, they have two bolts through the eye side for disassembly.
"We work in the dark, we do what we can - we give what we have. Our
doubt is our passion and our passion is our task. The rest is the
madness of art."
- Henry James; The Middle Years