When I got my Herbert Flashcap lathe some years ag now it came with an airchuck fitted.
This I took off and fitted standard 3 and 4 jaw chucks.
So if anybody can find a use for the old chuck it is free to anybody that can collect. There are a few boxes of softjaws. I still have the air body and the draw bar that went through the spindle. Things need a clean as surface rust is staring to form on the body but should still work.
Blackburn area for collection reply via newsgroup, if no interest it just goes to the tip.