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I think they can drift, how much not sure, but I do know that they have often been thru many techs or tech wannabes, so there is always the possibility of diddle stick drift which is my main concern. The BK 415 makes it pretty easy with all the bias supplies and many markers. With practice I am guessing doing a quick touch up will become easy. Of course you have to have a good enough CRT to produce a very sharp pic for it to matter.
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