Diagnosing what's broken on our servo tester

In this video I try to figure out what's wrong with my servo tester.
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[@pileofstuff]

Excellent timing. Mine stopped working on me too.
These things seem like a good idea, but it seems they are kinda fragile.

[@fabianot44]

Have you fixed it?

[@murataydemir3905]

how did you remove the knob from the potentiometer?

[@bluevisor]

pull