What these guys said, especially wd-40 add as a cleaning agent & then using a . One other thing that I noticed to happen to me & a set of custom scales I was making. I was about to put the final "tightening" to the wedge end of a razor while opening and closing the razor. A shift of the scales laterally affected the tension of the blade in the scales & centering of the blade. The squeezing of the scales could have done this. I actually now use this to my advantage to assist in getting a blade to center with new scales.