I recently acquired an Ohio Tool no 07 hand plane and my son has an Ohio Tool no 08. The no 07 is missing the tote handle and screws for the handle. The screws from the 08 fit perfectly in the 07 so we have examples of the screws. The toe screw seems to be like a Stanley and have #12-20 thread. The large main screw for the tote handle appears to be something else. It does seem to be 20 threads per inch but its larger than a #12-20 and a #12-20 will wiggle loose if it is used. I picked up a 1/4-20 screw to try at the hardware store and it is too big and doesn't fit so the screw seems to be in between a #12 and a 1/4. I am not an expert in screws but I don't know of a screw size that would match this. Anyone have any ideas what size this might be? Or is this an Ohio Tool special and I need to spend some time with my engine lathe making a screw?

thanks,
Chris