301 Hook Assembly
I just removed the bobbin case and hook assembly from a non-functioning 301 and sold it on Ebay. I hope you can find the screw without having to buy the whole assembly. I think a start might be your local sewing machine repair person -- one who works on mechanical machines.
My picture shows three loose screws -- those attach the whole assembly to the sewing machine. You are probably referring to the screw shown next to the part number on my picture. An eyeglass screwdriver should work on that size if the Singer bobbin screwdriver is too big.
Good luck!
Last edited by Daylesewblessed; 11-22-2011 at 08:11 PM.