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.
Do you have a watch that the back has to be unscrewed to change the battery or do you want to just unscrew it to see what's under the hood, then your in the right place. I explain how to unscrew off the back of a watch in this video. Watch used in this video is a Bently Motors Breitling Watch.