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I think you have the CRT pin numbering off a little. Pins 2&6 are connected internally to the focus element. Pin 7 is the cathode which connects to the video output.
Page 17 of the Sams Photofact shows how the wires connect to the main board. That's what they call "CircuiTrace Numbers". #20 goes to the cathode of the CRT (pin 7 not 6). That's what you have labelled as "CRT lead"
The last wire should end in a spade terminal. There are two possible places for it to connect on a little terminal strip in the center of the chassis. If all else fails, you can just leave it disconnected. The CRT may be a little out of focus but will work.
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