Where is the lever to open the closed door leading to the spiral staircase in the Channelwood area of Myst?

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It looks like there is a bug about the lever, whitch opens the closed door. But I I couldn't even find the lever. Where is it? Used to play Myst as a Teenager. Now I want to go throug this fascinating game again. Thanks for your help.
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Channelwood - Myst (2021) Full Playthrough - Episode 2
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Images: Max Vakhtbovych, Maria Orlova, Max Vakhtbovych, Charles Parker