1. If an exploaive charge other than a atandard TNT block ia uaed, make a hole in the center of the charge for inaerting the blaating cap. TNT can be drilled with relative safety. With plaatic explosives, a hole can be made by preaaing a round atick into the center of the charge. The hole ahould be deep enough that the blaating cap ia totally within the exploaive.

2. Tape, tie or glue one or two rows of closely packed naila to sides of explosive block. Nails should completely cover the four surfaces of the block.

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