A few months ago I took my drums from my jeep to have them measured to see how much they have been worn down. For those of us that know how to measure this, you use a micrometer, due to the fact this is gives you a precise measurement. What did the guy come out with? A tape measure! REALLY!!! I asked him if that is the way they measure wear and he said yes. Needless to say, I walked out and bought a micrometer later that day and did it myself. Not very impressed. Pep Boys near by did the same thing.