hammer mill can crush pebbles do. Easy Stone Crushing for Inlay 4 Steps (with Pictures . Step 2 Crushing. First put the .75" pipe cap on the 1" pipe. Second put the stone that needs to be crushed into the 1.5" pipe cap. Third put the end of the smaller pipe cap on top of the stone and give the end of the pipe 1 good smack with your hammer.
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