[SiriusHardware]

See attached.

I can't stress enough, the other end of the wire must be securely connected to the tube frame before you try to discharge the tube. Keep the wire itself well away from everything else in the monitor and don't forget to disconnect the monitor from the PET mainboard.

When you are sure you are properly set up, slip the tip of the screwdriver in underneath the edge of the cap, aiming for the centre of the rubber cap, and keep going until you hear a click / zap, and then keep going a little further until you hit something solid. At no point will you need to apply any force.