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3. Make sure the trigger and the safety nose mechanism move up and down without sticking. 4. Connect the nailer to the air supply. the safety mechanism is a mechanical device that can fail. never rely on this mechanism as an excuse to point the nailer at yourself or any bystanders. serious injury may occur. 5. Without pressing the trigger, depress the safety nose mechanism against a scrap piece of wood that is clean and free of any knots, nails, or other foreign objects. — if the nailer does not