Introduction
There are many issues that can be caused by a faulty motor brush. If you begin to hear banging sounds coming from the motor, this could be caused by the motor brush. Fortunately, a motor brush is one of the easiest parts to replace due to is accessibility. All you need is a standard flathead screwdriver to remove a cap.
Tools
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            Place down the Worm Drive Saw on a sturdy surface. 
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            The motor brush cap is located on the side of the main housing assembly, it can be identified as a large black plastic cap with a slit running down its surface. 
 
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            With the cap removed, the motor brush should now be accessible. 
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            Carefully remove the motor brush by sliding it out of the main housing assembly. 
 
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                            Conclusion
                          
                          To reassemble your device, follow these instructions in reverse order.