Charlene at The Sew Box is an expert on attachments...Singer in particular. The wrote the Sewing Machine Attachment Handbook. If you'll notice in the pictures she IS using a Singer slant shank foot. There's no trick to using a circular stitcher....just adjust it so that the distance from the pin to the needle is 1/2 the width of the circle that you want to make...3" circle=1.5" from needle to pin.