At 08:18 AM 4/9/2013, Mike Bucchino Sr wrote:
>A "loud motor type sound" can be the brushes riding against a
>poorly-machined commutator.  It will either cause the softer carbon
>brushes to wear out faster, or the harder copper commutator sectors
>to eventually smooth over and quiet down.  You can dress a
>commutator , if that's the case, but it has to be done very
>carefully and properly.

Too long ago for me to remember with clarity...that's conceivable
although I don't think so.  But dressing it would be next to
impossible, not an option for the average user.

Yours,
David