Beth, I'm sorry you are disappointed in your machine, but it is still wonderful to have. Yesterday, I bought a Singer 27-4 for my birthday. I have not cleaned it up yet, or purchased a new belt for it, but I am very happy. It looks nice in the house anyway. You can purchase machine heads on ebay if you are interested in replacing the one in your cabinet. They usually list the serial number so you can check to see what year and where it was manufactured by checking the Singer website. Good luck on learning to treadle. And have fun.
Oh, I think this could be addictive. Like buying fabric, but where do you hide a sewing machine? My poor husband!