Margaret, the feet on the T&S are slant feet. I bought a 700 series with a free arm T&S just for the feet and disks to go on a 401. Then the machine works kinda - the thread breaks. It needs a home it is sitting on valuable real estate - I wasted a bunch of time trying to figure out the thread breaking.... The motor and its parts might be good. Rubber feed dogs are hard to come by. Some times I've been able to steal a screw, needle clamp or a spring once or twice I needed a tension post or some other little part. Light bulb? Throat plate? The 600 and 603 are nice machines. I would use them. If you have a working T&S they can be nice machines once you figure them out. I just hate having to look in the manual every time I want to wind a bobbin. Besides an Elna makes better duckies.