Well, I've got years of experience, I was just out of it for the last 10 years, just trying to catch up, they didn't have brush serrators when I raced, wecut'em w/ dremels. I know that a regular horizontal serrated brush doesn't make sense to me, it will and does cut grooves into the comm reqiuring more comm cuts and shorting the comm life", now a cross cut will evenly distibute the force of the springs and arcing across the entire face. Just wanted to know if anyone knew of a serrator that will cut cross cuts, seems like a difficult cut to me. Thanks for the info.