Tim Uhler

Drywall screw guns are the standard tool for fastening drywall panels to wood or metal framing. Common corded models have a trigger lock-on button for continuous operation, a magnetic insert-bit holder that prevents screws from falling off the bit, and a nosepiece that fits over the bit holder to serve as an adjustable depth stop.

They also have a clutch consisting of two mating ratchet plates held apart by a spring. At rest, the clutch isolates the bit holder from the motor, allowing you to feed screws onto the bit with the trigger locked on. Once you load a screw, you push the tip against the drywall to engage the clutch, which drives the screw until the nosepiece hits...

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