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TM 5-684/NAVFAC MO-200/AFJMAN 32-1082

points for boring to determine the extent of any internal decay above ground.

b. Test boring. Whenever there is reason to sus­pect possible internal decay above or below the ground line, the pole should be bored with an incre­ment borer as shown in figure 4-5. It is usually not necessary in cedar poles due to their decay resistant heartwood.

(1) Increment borer. An increment borer con­sists of three parts-the borer, the extractor, and the handle, which also serves as a receptacle for the other two parts when not in use. The tool is made of the highest-quality steel to withstand the force ap­plied, though the borer has a cutting edge which must be protected from abuse. When boring below the ground line, the pole surface at the spot bored should be thoroughly cleaned of soil and grit by shaving or brushing. Bore toward the center of the pole, applying steady pressure to start, and in as nearly a horizontal line as possible. If any slant is necessary, it should always be upward to prevent any later water accumulation. The core is removed with the extractor by backing the borer a half turn after the extractor is shoved in, so as to break off the core before withdrawal.

(2) Plugging bored holes. All bored holes must be plugged by hammering in a tight-fitting treated wood plug as shown in figure 4-6, regardless of whether the pole needs to be replaced. Habitually and promptly drive a plug in each hole before boring another or before proceeding with other work.

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