I have 3 machines, a White Rotary with a Kenmore label, a 15-91 and a recently acquired 328K. They all work fine and are able to sew multiple layers of fabric and webbing. I don't need three machines and probably don't even need two. I plan to make some aiders, pouches and probably some saddle mods. My question is will the 328K do all that the other two in straight stitches? Any advantage to keeping either of the older straight stitch machines?