Hello,
I've been looking for an industrial sewing machine for many years. However I would use it infrequently and not willing to pay top dollar. A neighbor had a Hercules JS-555 with a FREE sign. I grabbed it and had the same research issues as you. I went online and compared the machine and parts to the Juki ddl-555 and they looked identical. I never found any information on the Hercules. My machine was missing the bobbin case. For a small price ($3.65) I purchased a bobbin case for a Juki DDL-5550 and it fit the Hercules perfectly. Hopefully, if I need another part, I will get the same result.
peter
