Upper thread unit. ... will loosen the upper thread tension causing the bobbin tension to draw the stitch into the material. ... C-30 Singer Sewing Machine 31-15, the 331K1, and the Consew C-30 are oscillating-type sewing machines that have aanbsp;...
|Title||:||1985 US Navy Aircrew Survival Equipmenman 1 & C|
|Publisher||:||Delene Kvasnicka -|