Yes, I've had both 600 and 603, and they were both worth cleaning up and passing on to others, as the gears on both models were metal as opposed to the later nylon. After the 603, I pretty much won't bother.
BTW, both models' "wind in place" bobbin system worked great.
Originally Posted by
miriam
They are just about the same as a 401 or a 500 except for the stupid bobbin area - well the 600 & 603 anyway - IMHO Singer blew it right then and there.