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Ordinarily that wire would be connected to the CRT mounting hardware and then a wire would go between the hardware and some point on the metal chassis. I can't say exactly where on the chassis but it should be a secure connection using a lug under a screw. Hopefully someone that's more recently worked on one of these sets can shed more light on what that hookup originally looked like.
Horizontal hold controls the scanning frequency, and from your video it sure appears to be locked.
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