If it's been sparking then the springs might have overheated, so by "OK"
I meant still adequate tension on the brushes.

On Wed, May 22, 2013, at 10:14 AM, Bob Blick wrote:
> Once the brushes start sparking, pretty much nothing you can do
> chemically will make it better. You need to make sure the commutator is
> OK and the brushes and springs are also OK.

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