Originally Posted by lysander Buna-N (aka, nitrile or NBR), 70 Shore A hardness, 0.071" thick. EDIT: While your uptown buy a 17/32 punch. Nitrile, yes, thank you. Don't know why I was thinking about neoprene as it's pretty spongey. Mechanic I know has a punch set that I can use. Thanks again.
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