Introduction
A defective drill trigger can unintentionally keep the drill on when used by operators and this safety hazard increases the chances of accidental punctures to nearby objects.
Tools
Parts
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            Eject the battery from the drill. 
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            Unscrew the seven M3x15.3mm screws, with the 2mm hex screwdriver bit, that secures the Housing Assembly. 
 
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            Motor Assembly/Gearbox and Trigger Switch removed from Housing Assembly. 
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            Desolder the black wire connected to the motor. 
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            Flip Trigger Switch and desolder red wire. 
 
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                            Conclusion
                          
                          To reassemble your device, follow these instructions in reverse order.