Might be that the commutator is also quite worn by the brushes sparking.
Might go away, might just die.
Brian

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The Sofa of Brian Gaff...

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"Jim GM4DHJ ..." wrote in message
news
just replaced the brushes....is it normal for new brushes to
"scream"...some noise ! .... or did I just not notice the noise from the
motor before the repair ..?