|Possibly I am the last person in the world to appreciate this, but just in case I'm not, here goes: I am so pleased to discover the many uses of what seems to known as a Ditch Quilting Foot. Mine is Janome, but there will be others similar, with a centre position metal blade to guide along the seams of a pieced quilt. I haven't been in any ditches yet, but I have used it by positioning the guide blade to follow the edge of garment, hem, fell seam, pocket, facing seam etc. for all kinds of topstitching and understitching. If the needle drop position on your machine can be altered, perfectly parallel topstitching becomes easy.