What could be wrong with the motor then? Can it be taken appart, checked and cleaned up? It's often wiring or condensers that act up when they get old. I had a 99K blew up on me, with bang and smoke, it gave me bit of a shock. After the blow up it blew fuse after few when I plugged it in. I eventually handed it in for repair and rewiring and it came back working fine, has ever since. It might be something repairable. The 401 model is very easily underestimated, it's not very pretty but sews up a storm. It's very well built with all metal gears, all I look I look for in a vintage machine. If you spend a bit of time, money and effort on it, it's one of those thing you never regret later on. It will serve you loyally ever after.