It is located at the bottom of the sewing machine, and the bobbin case thread goes through the needle plate to the needle. The first step in solving this issue is to set your stitch length settings, width, and length, back to their previous position before the problem began. BEST SELLING SEWING MACHINE: The SINGER Heavy Duty 4452 sewing machine is a true workhorse. Restoration of a Vintage 1970-71 Kenmore Model 158.1601, Restoration of an Antique Singer Model 15K Sphinx Sewing Machine, Restoration of Caroles 1950 Vintage Singer 201-2 New Paint and Decals, Restoration of a 1948 Vintage Singer Model 201-2 Sewing Machine, Restoration of a Vintage 1974-75 Kenmore Model 158.14301 Sewing Machine, Restoration of a 1952 Vintage Singer Model 201-2 Sewing Machine A Gift for Pat, Restoration of a 1925 Vintage Singer Model 66 Red Eye Sewing Machine, Restoration of a Vintage 1925 Singer Model 15 Tiffany Sewing Machine, Restoration of a Pink Atlas Precision Sewing Machine, Restoration of a Vintage 1941 Singer Model 66, Restoration of a Vintage 1950 Singer 201-2, Restoration of a Vintage Kenmore Model 158.14101, Restoration of a 1947 Vintage Singer Model 15-90, Restoration of a 1958 Vintage Singer Model 185K, Restoration of a 1975 Vintage Kenmore Model 158.1730, Restoration of a Vintage White Stretch Stitches Model 935, Restoration of a Vintage Singer Model 191U, Restoration of a Vintage 1973 Kenmore Model 158.18032 Sewing Machine, Restoration of a Vintage 1956 Singer Model 15-75 Sewing Machine, Restoration of a Vintage 1977 Kenmore Model 158.19412 Convertible Sewing Machine, Restoration of a Vintage 1960s White Model 1563 All Metal Sewing Machine, Restoration of a Vintage 1969 Kenmore 158.13033 Sewing Machine, Restoration of a Pink and White White Model 656, Restoration of a Vintage 1940 Singer 201-2, Restoration of an Antique Victorian 1894 Singer Model 15-30 Sewing Machine, Restoration of a Vintage 1956 Singer Model 221 Featherweight, Restoration of a Pink Atlas Precision Straight Stitch Sewing Machine, Reconditioning a Vintage All Metal Kenmore Model 158.19412 Convertible Sewing Machine, Reconditioning a Vintage All Metal Morse R5L Super Dial Straight Stitch Sewing Machine, Restoration of a Vintage 1956 Singer 301A, Servicing and Cleaning a Vintage All-Metal Kenmore Model 158.16011, Restoration of a Vintage 1947 Singer Model 66, Cleaning and Servicing a Vintage Kenmore Model 158.1755 All-Metal Sewing Machine, Restoration of a Vintage Singer Model 99K-31, Restoration of a Vintage Singer 15K-110 Sewing Machine, What Lurks Inside After Complete Reconditioning of a Vintage Sewing Machine, A Simple (But in Depth) Comparison The Differences Between a Singer 201-2 and a Singer 15-91.