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I have seen them so loose they don't stay on, and so well fastened that there is no good way to remove them. Sometimes glue, sometimes tar, sometimes just a force fit. I guess there is no standard way.
Replacing it with a cardboard tube isn't what I'd do, as the original usually has markings. Try rocking it, wiggling it, and pay attention to where it moves and where it doesn't. You may have to cut away parts of it.
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