Introduction
A damaged safety lever can be replaced by disassembling the gun with a screwdriver.
Tools
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            Using a screwdriver, carefully unscrew the three #00 1 cm Phillips screws holding the two slide pieces together. 
 
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            Remove the twelve #00 1 cm Phillips screws. 
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            Rotate the gun so that the front is facing you to remove the final screw. 
 
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            Lift the outside cover off of the gun. Only the side where you removed the screws will come off. 
 
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            Remove the seven #00 1 cm Phillips screws that attach the inner mechanism to the back cover. 
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            Remove the #00 1.2 cm Phillips screw located to the right of the white casing. 
 
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            Disconnect the inner mechanism from the outer cover by lifting the inner mechanism towards you. 
 
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            Rotate the gun so that the top is facing you. 
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            Remove the two #00 1 cm Phillips screws holding the white safety cover in place. Lift off the safety cover. 
 
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            Pull the lever up on one side with some force until the knobs on the side of the lever pop out of the grooves. 
 
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To reassemble your device, follow these instructions in reverse order.