Telescopic Rings - What is the most telescopic structure that you know?

More OskarPuzzle at https://www.youtube.com/OskarPuzzle?s.... Print it yourself at https://oskarvandeventer.nl/Print-It-.... Telescopic Rings is a set of 3D-printed concentric rings that can be pulled to a tall tower. It does not have any useful application yet. Do you know one?

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