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You need to discharge the HV supply, then remove the HV lead from the CRT. Here's how:
You will need a LONG (at least 12") preferrably thin flat blade screwdriver and a lead with alligator clips at either end. Its always nice to have a rubber mat to stand on to isolate you from earth in the event you make a mistake.
1. Connect one lead to the ground strap on the aquadag coating of the CRT. its usually a thin metallic strap. DO NOT CONNECT IT DIRECTLY TO GROUND OR YOU WILL TOAST YOUR ICs. The ground coating on the CRT slowly bleads off the HV.
2. connect the other end to the screw driver about halfway up the shaft. Now slowly slip the screwdriver under the rubber cap at the top of the CRT while keeping it towards the middle. You should run into the Bare HV lead underneath and hear a healthy SNAP. Keep the screwdriver there for AT LEAST 30 seconds, I would do at least a minute. This will slowly discharge the HV.
3. carefully lift up the cap on top of the CRT and see how the HV lead connects. Usually you have to pinch the clip to get it out of the CRT. I usually gently push on one side of the clip (with the screw driver) until it its out of the hole, then gently pull it in the opposite direction to get the rest of it out.
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Jordan
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