Has anyone experienced the phenomenon of failed plain plug gauges, specificly the nogo member when the results show that the gauge has grown in size? What i'm talking about is a gauge with a .00006" tol. And the results showing the gauge to be oversize by .00002". The gauge is a class "x" and has passed calibration for the past 3 years. I call this a phenomenon because theoreticly the nogo member never enters the part being checked. I would also mention that the same outside calibration lab has preformed the calibration for the past 4 years. Can anyone shed some light on this subject for me? Any information would be appreciated.