Apr. 1, 2015. TDK Corporation has announced that its Hong Kong-based HDD head manufacturing wholly owned subsidiary, SAE Magnetics (H.K.) Ltd.
You use a wrench to screw, or unscrew a bolt. A screwdriver is for screws. Either way you turn it left. Some bolts have reverse threads and would turn the other way to unbolt.
NOTE: This is a very important step as the bobbin can become unthreaded and cause sewing problems if it rotates clockwise. Pull thread through the slot (A) and then to the left. With a finger held gently on top of the bobbin, pull the thread until it stops in slot (B). Then pull about 6 (15 cm) of thread and lead it towards back of the machine under the presser foot. NOTE: This is also a very important step to assure the bobbin thread does not slip out of position.