Is not a good idea. Either when you are tightening, or loosening the screw holding the heat-sink in place, the sharp edge of your washer WILL score your motherboard. There is a second layer to your mother board which supplies positive power to your ICs. If the first layer is penetrated and the two layers come in contact, you will fry your motherboard when power is present in the board again (hopefully you're not repairing it while it's plugged in...).
I recently had a customer supply me with an Xbox elite to repair which his brother had attempted to fix. As usual, before I opened it, I plugged it in to diagnose the fault and was quite surprised when smoke started coming out of it. The board was repairable (possibly) with fault testing, but with spares being not too expensive at the moment, it was cheaper (end easier) to replace the whole board.
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