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Turn the grinder over again, and carefully lift up the capacitor as shown with a any suitable tool to hand: a small flat bladed screw driver is fine.
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In addition to the two capacitor leads, there are what I take to be red and blue stator leads. As normal on such tools, it is a universal motor with 2 simple stator windings and a more complex rotor with brushes. The brushes are at the top and bottom, and can be inspected at this point.
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You might need to change or service the brushes at this point, but that is not covered here.
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Remove the red and blue stator wires from the switch next to the capcitor leads. Use long nose pliers to pull off the crimp connectors: this needs a bit of force, so be careful and pull directly along the terminal axes. The picture shows the blue wire disconnected.
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Examine the switch and note how the black rod engages with the push button.
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Notice that the switch has what seems to be a copper heatsink on the side nearest the blue lead.
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The switch is now held only by the two grey plastic clips.
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Insert suitable spacers between the body of the switch and the clips. I cut a wooden cocktail stick in half, and inserted the sharp ends behind the clips and tapped the pieces until the clips were just clear of the switch.
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