Kenmore 1750
I have bought and fixed up model 1750 many times, as well as the near look alikes (there are probably 8 models which all take C cams, are pale green, some with white top and details, as I shared in another blog post), mostly because it is my mom's favorite model, so we haveone at each of my sibling's homes, where Mom lives, several months at a time, so she always has "her" machine, and can sew without relearning a new model. 1750 is a smooth, HEAVY machine, and does require a zigzag cam, be installed on the top of the machine, in addition to a stitch width setting above 0 in order to sew a zigzag stitch.