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As I was cleaning up the block and de-stressing all sharp edges and such, I accidentally slipped with the grinding burr inside a couple of frost plug holes. This made a small mark on the mating surface of the frost plug holes. I asked the machine shop to put some kind of sealant in the holes before putting the plugs in and he didn't. So, the question, should I pull the plugs and put sealant in the holes, then re-plug with caps or should I have them tapped out and put screw in plugs?