On my Bernina 440 I finally discovered a scant 1/4" seam is two clicks right and line the fabric with the edge of the #1 foot (the basic zig zag foot). On my Featherweight, I have to use a seam guide. I got a large plexiglass seam guide from
https://www.novamontgomery.com/shop/...ight-Guide.htm. There are other similar guides at different places. It works great. Since I alternate between the two machines, I use a seam from the Bernina as a placement guide for the Featherweight. The adjustable guide is the only way I get seams that are exactly the same size on both machines.