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.
To do this you can use the skewer to hold the freewheel tool in place while you use a large wrench or vise to grasp the free wheel. Always turn the freewheel counter clockwise to remove it. View the discussion thread.