what material is safe to put in damaged PCI-e slot to prevent pins from accidentally touching?

horror

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Feb 10, 2011
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I have a damaged PCI-e slot. Lucky for me the pc works just fine if I dont use that slot. The pins have been fine for a while but I would like to stick a piece of cardboard or something in there to make sure none of the damaged pins ever try to move and accidentally create a short. I just need to know what material is safe to put in there that wont damage things and wont cause issues with the PC if possible. Thanks.