I have a Commodore 1084 NTSC RGB monitor, it's based on Phillips CM8833, assembled in 1988. It works, but slightest movement affects the picture, and more often then not I need to knock on it repeatedly, until all the needed connections get back together and it works properly again.

I'd like to:

1) Replace the power cord and power switch.
2) Replace all electrolytic capacitors with fresh.
3) Clean PCBs from the 20 years worth of dust.
4) Remove old solder on all external connectors, resolder them with new quality solder and flux.
5) Add missing components and connector for EURO-SCART.

To do all this, I first need to disassemble it. The problem is that main PCB has a giant metal component, attached to tube with a think wire, ending with a plastic sucker thing.

QUESTION! Can I just sort of peel of the sucker thing? If I do that, how can I reattach it back?

Someone on those photos disassembled Daewoo flavor of 1084, and looks like she/he even managed to put it back together.

Oh, one more thing. It looks like all external adjustment potentiometers (hight, width, trapezoid, sharpness, brightness, color, audio volume) are very dry. Using them doesn't change parameter in expected continuous way, but jerks it rather unpleasantly. How do people fix this? Can I use some vaselin or something and rehydrate old potentiometers? Won't that change their nominals? Or should I just sort of leave them be?

If someone ever repaired CRT monitors, please help me out, I'll be very grateful!

I believe the wire that attaches to the CRT underneath the rubber boot is part of the horizontal circuit. It's very high voltage! The CRT can still hold a charge after it is powered off, so normally you can take something like a screwdriver and use it to make contact between chassis ground and that connection on the tube. It should make a nice POP and discharge the tube so you don't fry yourself while working in there.

As for potentiometers, I would get a spray can of "Cable Clean" or maybe even WD-40, with the small straw that attaches to the nozel, and spray a little inside them. Then turn the knobs back and forth, and that should clean it up so they work smoothly.

You only have to solder the High Voltage Trafo.
Then the problem is solved