Pendulum amusement ride collapse.
<video controls autoplay loop>
<source src="https://s3-us-west-1.amazonaws.com/hmt-forum/pendulum_ride_collapse.mp4" type="video/mp4">
Your browser does not support the video tag.
</video>
Previously:
https://www.homemadetools.net/forum/...2516#post76503
https://www.homemadetools.net/forum/...1273#post74087
https://www.homemadetools.net/forum/...710#post136761
https://www.homemadetools.net/forum/...095#post125771