is the bobbin case hard to find for one of these? there was one on ebay (may still be there) but from one of the pics I didn't see a bobbin case. will it take any class 15? think it's class 15 didn't research that far into it since I do NOT need to add another machine to the herd when I've already committed to get one next weekend..sigh...didn't make it out there after night shift yesterday morning so that leaves next fri afternoon or sat at the earliest to make the trip out...