Bobbins turn up, I find them on ebay, Helen Howes, etc... I think the grasshopper (Elna 1) and Supermatics use the same bobbin. There is a groove inside the "hub" that makes them go on the bobbin winder. That's the main differences between the metal Elna Bobbins, and you have to make sure they have this groove. I wouldn't hesitate too much if the price is right. I have yet to find the early grasshopper with out scratch marks on the finish.