I have a 1950 singer 201-2 and it's great other then the fact that it goes slow and then sometimes speeds up on it's own when I have the pedal all the way down. I asked the repair shop about it and he said it's just "showing it's age". I was just wondering if this happens to anyone else? It's annoying when I'm trying to sew and it's not consistent, it screws me up and startles me LOL