Repairing a modified dollar store light

A year or so back, I made some modifications to a cheap dollar store light, and until recently it was working well.
Until it didn't.

Today, I'm checking what's wrong and fixing it.

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This isn't the only way to do it. It's probably not the best way to do it. But it's how I did it. ... https://www.youtube.com/watch?v=ksJpO0W2SOU