Hi, I have acquired a 1917 Singer Sewing Machine, and I am looking for parts. Any ideas as to where I could locate some parts for it. It is a model 127. I am specifically looking for a caster for the bottom of the frame, a belt that goes from the treddle to the actual machine and a knob for one of the drawers. Thanks in advance for any information you can shed on this. Cheers, Andy