Introduction
A faulty motor rotor can cause sparking and other serious issues with the saw. This is a guide to replace the motor rotor. Although it is an intensive project, it is doable and all you need are a Torx T20 screwdriver, a Torx T50 screwdriver, and a flathead screwdriver.
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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            Maneuver the RIDGID saw, in order to easily remove the upper blade guard assembly. 
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            Using the T20 Torx Screwdriver, remove the four 4/10 cm screws that attach to the gear box. 
 
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            Using the T20 Torx Screwdriver, remove the two 4/10 cm screws that attach to the handle of the device. 
 
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            Maneuver the saw to get to the base plate. 
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            Using the T20 Torx Screwdriver, remove the two 4/10 cm screws that attach the upper blade guard’s base plate to the main housing assembly. 
 
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            Using the T20 Torx Screwdriver, remove the four 10 cm screws that attaches the main housing assembly to the gear box. 
 
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            Wiggle out the gear box to easily gain access to the motor rotor. 
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            Once taken out, the motor rotor is easily accessible. 
 
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            The motor rotor is lodged in between the armature and can be identified as a rod containing a fan blade. 
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            Carefully remove the motor rotor from the device. 
 
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To reassemble your device, follow these instructions in reverse order.