I'm pretty sure I read on here that machines can be treadles if they have the groove in the hand wheel for the belt. If it doesn't have a groove it can't be treadled? I have a 66 in a treadle base, but I can't get the belt to stay on....I don't believe there is a groove in the wheel. Was this once an electric (I have an electric that runs great)? Are the hand wheels interchangeable...can I even try to make this machine work??