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Hey Chicagomike, thanks for making that really clear for me. Because I have not yet seated brushes, there is just one final piece of information I need to know. Those 3-4 seconds of using the stone, does that: a) Put the commutator curve across the full width of the carbon brush? OR b) Put the...

Hey Chicagomike, thanks for your reply. Regarding question 2, you started with 'Run until it is clean' Can you explain exactly what you mean? I am guessing this means either: 1. Apply the stone for a few seconds until the sparking between the commutator and the carbon brush reduces to the...

Hi, I have joined this forum to hopefully get some questions answered by some really clever Kirby people. So I hope that you are out there guys!!! 1. I believe that new carbon brushes are about 20mm long. At what point is it recommended to replace them? I have seen various lengths...