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Singer 401A, 403A, 500A, 503A

 Cam Chart

This chart has the 400 models shown, but they are the same cams as for the 500A and the 503A, and some other slant-shank machines.  There is a difference in the appearance of the stitch selector knob between the 400s and the 500A, follow the instructions in your manual for the knob combination setting (s). Note the "top-hat" shape of these cams, as there are flat cams for the Singer models 306, 319, 328, and 348 that will not work in a 500A. I have left this page very large for ease of reading.

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