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I literally just bought a rubber mallet off Amazon like an hour ago. It'll work way better than duct taping a cork coaster to a hammer.
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Believe it or not, your typical dollar store will frequently have acceptable rubber mallets. (Not a dollar, but very reasonable). Also, variants of “batoning” (striking a tool with wood) and/or using a wood block to diffuse impact with a hammer can work quite nicely.
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