This device changes the direction of the drill head. The original just stopped working, and when I disassembled the drill (which wasn't really difficult) I saw the problem: one of the two plastic levers holding the direction switch broke. Easy enough to fix but was disappointed that it broke in the first place. If you have the same problem, please feel free to buy a replacement. It's easy to do. The only downside was that it cost about $8 and was an add-on that I had to buy $25 or more to ship since it's so small. However, I would do it again just to have a working drill/screwdriver.
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