Having to change a cylinder because the keys are difficult to use, probably because they are copies of copies of …, is fairly common. And from time to time, it’s the communal door where the problem has occured.
As soon as you get above even a couple of apartments in the building, you face a dilemma. A new cylinder with a new bitting (the key pattern) will require not just cutting, but handing out, a lot of new keys. So can’t you supply a new cylinder but one using the same key as before? I could, and if the problem turned out to be that something is wrong with the lock itself that would work; however, if I understand you correctly, lots of residents have poor keys; and if I supply a new cylinder expecting a good key, the problem isn’t going to go away. Ah, yes.
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