Remove the nails from the nailer. Place a 3/8-inch open-end wrench or a 5/32-inch hex socket wrench into the lock nut to adjust the depth of drive for the nails.
Turn the lock nut counterclockwise to loosen it slightly. Move the work contacting element down if the head of the fasteners is being driven below the work surface.
Loosen the lock nut. Move the work contacting element up slightly if the fasteners aren’t being driven far enough into the work surface.
Continue to loosen the nut and move the work contacting element up or down until the fasteners are being driven into the work surface at the proper depth.
Increase the air pressure on the nailer if the nails aren’t being driven completely into the work surface. Reduce the pressure if they’re being driven in too far.