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Old 09-16-2013, 08:53 AM
  #14  
ArchaicArcane
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The carbon that wears off the brushes is also flammable, so it makes sparks too. Same thing you see in an electric drill, for instance. Our drill have never been oiled but it sparks. It could probably use a little TLC too, but I'm leaving that one for DH.
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