This is a brass plated cast zinc or some kind of plating but zinc underneath. The reason the letters are sometimes difficult to turn is because there are ridges on the body where the cast has a seam, there are several of them and if you put it where the wheels turn it will release him. . Lubrication is not required, this is the root of the problem, a cast that is a bit rough along the seam. It is very common in castings, whether ceramic or metal. Just where it doesn't manifest itself, there are high points. If you are mechanical you will see it. Changing the code was easy, just look down the barrel where you see the notch and figure out how to align the notches to create the groove. Mine was coded as ILOVDU and I was able to open it, proving that nobody is perfect.
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