How to wear the bottom line of the old pedal sewing machine

The bottom line is brought up by the thread. The method is as follows: Thread the wound lock core into the shuttle shell, press it into the shuttle skin on the shuttle shell through the small groove on the shuttle shell, and reserve a thread end of 4 cm. Then, put the shuttle shell into the shuttle bed and thread the upper thread. Pull the thread head with your left hand (the thread should not be too tight), and turn the handwheel of the sewing machine counterclockwise with your right hand, and the bottom thread will be pulled up, so you can start sewing.