Towa Bobbin Case Tension Gauges Style:L Style 21) to download the manual

21) to download the manual to learn how to change the lenses

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Towa Bobbin Case Tension Gauges Style:L Style 21) to download the manualTo determine your bobbin's tension, place your bobbin inside the bobbin case with the thread unwinding in the correct direction, then feed it into the TOWA Tension Gauge. Take your bobbin thread and run it underneath the bottom wheel, over the top of the top wheel, and inside the catch. Pulling the thread to the side will show the top wheel moving down while the numbers increase. The higher the number, the tighter the tension. To release tension, turn