Introduction
Tools
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Rotate the chuck counterclockwise until it stops rotating.
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Inside the chuck, the “chuck screw” (M8.0 x 1 LH T-40 Chuck Screw) should now be revealed.
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Insert a 10 mm Allen wrench bit into your screwdriver body.
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Remove the chuck screw by rotating Allen wrench counter-clockwise.
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Conclusion
To reassemble your device, follow these instructions in reverse order.