Bev,
The foot measures 9/16" across, the same as the zig-zag foot.
Each toe is just a hair over 1/4" wide. There's almost a 1/16" between the toes.
Charlee,
The bottom of the foot is smooth. No groves of any kind.
OBTW, where is that thread we had a week or so ago about the darning or FMQ springs?
I forgot to book mark it.
Joe