length: 1.950in
internal diameter: .375 to .380in
External diameter: .461in
bobbin length: 1.34in
bobbin diameter: .360in
setscrew hole diameter: .072in
[ATTACH=CONFIG]521321[/ATTACH][ATTACH=CONFIG]521322[/ATTACH][ATTACH=CONFIG]521323[/ATTACH][ATTACH=CONFIG]521323[/ATTACH][ATTACH=CONFIG]521324[/ATTACH][ATTACH=CONFIG]521325[/ATTACH]
I think that a 2 inch singer one might work, the shuttle has a bit of wear (almost enough to account for the 40 thousandths). The last photo is a back view, I'm not exactly sure if the long diagonal slit is common.
Thanks for the help.
Julia