I saw a neat tutorial the other day where the an adjustable "stitch in the ditch" foot or a hemmer foot can be used for making straight column stitching next to each other, like top stitching on a collar or anything using that little bar as your distance guide. Think it was a Claire Rowley video on YouTube. Don't know if I am saying it right but it was a neat I idea I had not thought of.
Marysewfun