I have a customer who wants neoprene compression sleeves made and all of his examples are all zig zag stitched. He is wanting large quantities made and I'm not opposed to buying a machine to do the job (who doesn't like a new toy) but I'm unsure what machine to get. I've been looking at singer 20u models but don't know their limitations i.e thread size,foot lift. Any knowledge or opinions on these machines or any other zig zag capable machine is much appreciated