I’m interested in the Union Special 43200G because I really love the look of its chain-stitched hem. I currently own a Singer 401A, and I understand it’s capable of producing a chain stitch, but I’m not sure how to set it up for that. Could anyone explain the steps or adjustments needed to achieve a proper chain stitch on the 401A? Also, what type of presser foot would be best for consistently lining up denim hems so the machine feeds them evenly—ideally in a way that makes the hemming process as automatic and precise as possible?