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They are small black screws with a blue spot on the shaft. If I remember correctly, they were inside one of the drill mount/coupler bags. Or maybe it was the actual drill bag?
Anyway, if you look at the output shaft of the gearbox, you'll see that it's hollow. The left-handed screw goes in the inner hole. The Aluminum hex piece that screws onto the outside as a hole in it that this screw goes through. It's not threaded, but it is a clearance hole.
--Rob
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