The worst I saw was in a shop when I was searching for my first treadle. It was a Singer 127, and had all sorts of vintage stuff glued to it. Doilies, pictures, spools of thread, even its shuttle and bobbin. I just wanted to take it home and turn it back into a sewing machine instead of a tacky craft project. I settled on just restoring the sad looking treadle I found and leaving it behind.
