There is something like 111 different stitch cams that fit this Elna Star sewing machine, making all of their machines use the same stitch cams, was a stroke of genius! Because these vintage Elna's (which include the Supermatic) were so well built, & you could update your old sewing machine, just by purchasing the newest stitch cams, Elna built a huge following of faithful fans! The only reason they are so cheap used, is because America & other "western civilizations", are able to purchase clothes ready made, cheaper than they can make them, & because computerized sewing machines are the newest trend.
These older mostly metal sewing machines will last much longer, & sew better than any of these lightweight computerized plastic machines made today. The Star can actually sew more designs than the Supermatics, because of the built in cams can be used with the removable cams, to create new designs, as well as the removable cams being able to sew their specific stitch.. The Supermatics do not have any built in cams, which is why these Stars don't stay for sale long, they get snapped up quickly! Best of luck!
Becky