I strongly dislike this machine because of its rubber feed dogs which work poorly when they're old, finicky bobbin-filling system, fragile (after 40 years) plastic gears, and annoying setting adjustments. My suggestion is to save the cams, donate the machine to Goodwill (although that would spread the suffering, wouldn't it?) and take some time to find yourself a 401, 403, 500, 503, or early 600 with metal gears. They can use the cams (the black "top hat" type), they're far better machines and can still be found inexpensively, although they're finally being recognized as the versatile workhorses they are. Note that the "double action" embroidery cams (I believe they're white) from your 700 series will not work on the earlier models. Not much of a loss unless you really, really want to make rows of little duckies.
Last edited by Manalto; 10-13-2015 at 12:31 PM.