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also don't use hard plastic.
you also have to remember there are tiny resistors and such right under the x-clip and you can break them off with excessive force and hard plastic.
use a medium density rubber material or cardboard. that way the resistors and such can sink into the material and not hurt it.
The hard plastic spreads the pressure evenly so there is not very much pressure on each resistor. Besides it's not floating in thin air and it won't dig into the board. My Zalman Cooler also has a backboard but one of metal and that cooler is much heavier that this one.
You can see how well it works by pushing screwdriver a screw driver into the palm of your hands. When it hurts stop and apply the same pressure now with two square pieces of jewel case between your hand and de screwdriver. That difference alone is huge. You'd need a hammer to smash those resistors under that piece of plastic.
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force exerted down on the heatsink isnt the fix, and can damage things, and is only a temp fix.
i have done several ring of death boxes and simply pulling the heatsink and clips off has actually bought the units back to life.
The two pieces of plastic are roughly as thick as the black devil minus the height of the clamp and resistors. So the pressure is equal but spreaded.
The force is actually exerted upwards and downwards equally.
The screws go back the same as it went out. The clamp does not touch the casing here. Something must have gone wrong.