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With use of non-electric blasting caps and fuses, the main cap is installed on the end of the main fuse and then crimped. All of it is exposed.
At the explosive end of the main ring branches the blasting cap is properly installed in a threaded cap well in the explosive block and a priming adapter is slid over the wires for an electric cap or the fuse of a non-electric cap and screwed into the threaded well. This covers the end of the blasting cap completely.
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