It's pretty well known that vintage Berg Larsen mouthpieces run about .005" smaller than indicated. In other words, a piece stamped .110 will actually measure .105". It seems that they are quite consistently .005" smaller, so it isn't just incidental variation from piece to piece. My question is, why is this? Surely they didn't go decades with mis-calibrated equipment! Also, do new Bergs follow suit, or do their stampings more accurately reflect their tip openings?