bkay - there are a couple of threads about the walking foot over on VSS from about 5 years ago. According to Cari - "Singer never made a walking foot for the 301. This comes up from time to time on several groups. Some have been able to get one to work, others haven't. Jenny at Sew Classic sells one that she modifies herself for the 301 but I haven't bought one to try it." (italics mine) Lori has one that works "It is good, but not great, because starting out on the piecing is difficult, chain piecing is better."
It looks like the slant shank walking feet were made for the zigzag machines and the toes don't line up quite right for the 301.
Janey - Neat people never make the exciting discoveries I do.