Robert Murray Smith made many videos on mechanisms like these https://www.youtube.com/@ThinkingandTinkering/videos

Hadn't seen this channel before.

Its great, but also pretty tragic.

For those who also haven't seen it before who might follow: the presenter (who demonstrates the mechanical mechanisms) lost his wife to a heart attack in 2024, kept the channel going for another 1.5 years, made a seemingly happy 'My Last Video' video that presented the end as just running out of new things to talk about, then he killed himself.