coolrcdad, the Putnam brushes are a little different than any other brush out there. What a lot of people recommend doing is to run the brush in the motor so that the serrations wear down a little bit. Then go ahead and cut the com and run the motor for a little bit again to reseat the brushes and then you are good to go. What happens is the brush is hard enough it grooves the com where the serrations are so that is the reason behind break in, cut, and break in again. I am sure you will be pleased with the results.
