Shim washers and a holder to bore them to size

[Frank S]

Great tip Frank S. I think this classifies as a lantern chuck.
Advising readers that a cap will secure them, providing there is a significant hex or square for tightening. Plug style works too, with the end under thread diameter imparting pressure; might also be less dependent on quantity to fill and clamp.

I guess you are right it probably does qualify as a lantern chuck, I've always thought of lantern chucks as some delicate thing for holding tiny little screws by the head. But nothing says things have to be small to have the same name. I have a 26" lathe in my machine shop van that LeBlond Classified it as a tool room/ gun smiths lathe Their analogy is it has an extra wide bed and disproportionally long wings on the carriage. I noticed that it has 126 possible thread pitch combinations and a simple change of a cople of gears on the feed drive will give it 126 different pitches I may never run out of thread combinations on it