Brother PQ1500S Operation Manual page 13

Bobbin Winding Clutch
] Place the thread end so that it does
not protrude from the bobbin.
7 While holding the end of the thread, step on 8 Stop winding process when bobbin is 9 Manually move bobbin winding clutch 0 Cut thread and remove bobbin.
the foot controller for a few seconds. Once full. Take the foot off foot controller. back to original position.
enough thread has wound itself around the
bobbin to hold itself in place, release the
foot controller and trim the excess thread.
Continue to wind the bobbin while pressing
down on the foot controller.
8