Sakura Sewing Machine 9302 Manual Patched -

Adjusts how tightly the upper thread is pulled.

One of the most common complaints about the 9302 is the bobbin not winding evenly. The manual reveals the trick: you must disengage the clutch (turn the inner handwheel toward you) before winding. Failure to do this will result in the needle moving while winding—a sure way to break something. Sakura Sewing Machine 9302 Manual