machine shop?

Haven't turned a drum or a rotor since 2001ish? Didn't make sense when even then rotors were available for $20 each and drums were becoming a thing of the distant past. Of course I remember the chatter belts--wrap um tight and even then on big bus drums they'd still sing their song's. J.Rob
It is my understanding that "new" drums should be turned before use. I believe it as my new ( un-turned) drums still pulse my peddle.