Door Closing Cam Disintegrated

The door closing cam on the refrigerator door was a snap to replace. However, I'm still baffled on how to replace the freezer door side. The condensation tube from the door runs through the door pivot and joins to a compression fitting behind the bottom trim piece. The compression ring is behind a formed lip on the tube and won't slide off. I could cut the tube but I really didn't want to do that. If anyone has done this and knows the trick to replace it, I would appreciate it.

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