Juki TL2010Q Sew & Quilt Machine 9x6"Arm +Sew Steady Sit Down Free Motion Extension Table 32x24"+Westalee Ruler Foot* Template Tape Gauge

Sub Tension Unit Even if strongly twisted thread should be used, the unit will avoid "return of twist of thread" and supply needle thread to the main tension unit without thread quivering. It helps sewers create sttiches with stable thread tension.