One of the attributes of a great watchmaker is that he takes good care of his screwdrivers, and that he can sharpen them efficiently when they are becoming risky to use. The students spent 2 weeks only sharpening screwdrivers, by hand and without any helping tools. It takes a lot of practice - and blood, sweat and tears - to be able to do this and screwdriver sharpening free hand is also a great way to maintain the micro-mechanical skills the students have acquired.
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