We have a few of these at work and I liked them so much I had to seek them out and buy a set for home use. It wasn't easy because there was no word "skill" in the index of exercises, but I persevered and found it. I drilled a rigid 10-32 shoulder bolt and wrench after normalizing. This dulled the drill and I had to resharpen it, but it worked. Just keep them cool.
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