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6. Avoid overdriving power fasteners with too strong a power load. Repeated over-driving is frustrating, damages the tool, and results in a weaker coupling between the wood and the concrete. Use either a rubber mallet or a block of wood to tap the piston back into the muzzle. Inspect the barrel assembly, and open the tool’s chamber to confirm that both the piston and barrel are working smoothly. If the gun is damaged, have it repaired at a service center.