I would measure the mandrel thoroughly and try to find the bad spot if there is one.
Put your eye at the end and look down the mandrel to see if you see any curvature or irregularities (foreshortening)
Also, get something VERY straight and lay it the length of the mandrel all around the circumference to see if there are any gaps that indicate depressions are bends.
I would try very hard to diagnose the problem before cutting anything.
Did the tube come off about the same amount this time as it did when it got stuck last time? If so, that kind of consistency is a big clue...
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