Originally Posted by Wintersewer
The 503 and it's "big sister" the 500 were sometimes referred to as "Rocketeers" It's easy too see why.....the way they look!
They are actually the same size. The 500 does built in stitches - the 503 uses disks to do the same thing. Sew Classic has a chart to (I think it is on the 401 page) match up the disks and the built in stitches.