Do a search for woodworking and you'll get some hits. There's a local place I use named, Rockler. I think it's a national chain, as they send brochures in the mail. They have tools, glues, stains, veneers and finishing chemicals.
You might get a brochure the same way. Just do a search for "Eldridge Two Spool Treadle manual" and will probably find it.
Good luck.
bkay