https://www.youtube.com/watch?v=VmdlOhMWwu0
See ~08:15 minute mark.
I don't know what happened.
I'd double-check to ensure the top of the mainspring isn't somehow broken.
I'd double-check to determine where the top of the mainspring hooks onto the "stirrup" is ok.
Hopefully all relevant parts are unbroken and it was some weird mis-assembly issue.
Here's another video: https://www.youtube.com/watch?v=YPoOqBArPaM&t=271s
Look, starting around 16:25 minutes for perhaps some better video. The talking gets a bit distracting. Turn down the volume which may help.
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