Yes the Singer 503 requires disks. With the disks you can vary the stitch width. With the Singer 500 you can not vary the stitch width unless you have a disk. IMHO the stitches look a lot better on the Singer 503. Oh and there aren't any extra stitch designs on the 500 if you have all the disks for the 503. The 503 is much easier to clean up.. Singer's 500 series "Rocketeer" machines epitomize space-age styling with their distinctive oval arm shape and futuristic aesthetic from the early 1960s. This guide details the technical specifications and differences between the Model 500 (with built-in stitches) and the Model 503 (which requires cams for all zigzag functions).
sabrinatf recommends this Singer Sewing Machine after buying it 2 mos ago Posted 3/21/06. 9,480 Views. Review has 10 Helpful, 11 Very Helpful ratings. Singer 503A Sewing Machine Information. (500 and 503). I would NEVER trade, sell, or lend this machine to anyone. I love, love, love it!. Singer 500 503 500A 503A Sewing Machine Pop Up Spindle Spool Pins Springs. Pre-Owned · SINGER. $19.95. $4.29 shipping