![]() ![]() The 15-91 uses standard household series HAx1, which is available wherever home sewing needles are sold. It also reduces the maximum clearance under the foot by about 1/16 inch. An even-feed attachment, or roller foot compensates for this and allows the top layer to move freely, while still maintaining sufficient top pressure as the needle moves up. The standard steel pressor foot, when sufficiently tensioned down to prevent the material from lifting with the needle, usually drags the top layer of stitcky material out of alignment with the other layers. Sewing sticky materials, like Marine Vinyl and soft leather, requires an even-feed-walking foot, or a roller foot attachment (low shank). This Singer 15-91 is capable of sewing cloth and Denim fabrics to over 5/16" thick with the standard foot. It was fully functional, with a rebuilt "potted" motor, and was sold for $200.00 at my leathercraft and sewing business, R&W Custom Leatherworks, inside Collette's Vintage and Antique Mall, 5350 Davison Road, Burton, Michigan, 48509. The Singer 15-91 in the photo on the left was built in 1953, according to the Singer machine serial numbers lookup (for double letter prefixes). The last 15-91 made by "The Singer Manufacturing Company" was in the mid 1950's. The Singer 15-91 is the final model in a class beginning in the late 1890's with the 15-30 class, which was replaced in the mid-1930's with the 15-88 treadle operated and 15-89 hand cranked, followed by the 15-90 w/side motor and belt, then the 15-91 w/built-in "potted" motor. ![]()
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