MadCow,
Hmmmmmm, that teflon SS foot is kind of interesting.
The reason for the straight stitch size foot is because of the narrow 1/8" (?) right side toe. I use the edge of the foot sometimes as a guide and the wider footsies are too wide for what I"m doing.
The 1/4" foot would be great for piecing, but I've got that covered.
I'm gonna check with my LSMG and see if he's got any of these.
Joe