Parts manuals don’t say it all

Parts manuals are good for figuring out what a component of an airplane does, but there is no chapter in the manual that lists what each hole is used for! We were perplexed by the 5/32nd holes seen on each side of the P-51 Mustang’s .50-caliber machine guns. Just what did they do? It turns out that are used to boresight the fighter’s guns. Each pair of holes helps correctly orient a boresight fixture, which spans the front of the gun and holds a steel rod inserted into the gun’s barrel. This tool helps armorers shift the gun’s aim up, down, left or right to make all of the fighter’s bullets converge at a single point in space out in front of the aircraft.

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Using a rod to assist in running wiring through an attic space, Don Thomas, of R&D Handyman Service, works on installing a ceiling fan at a home in SE Everett on Monday, July 24, 2017 in Everett, Wa. (Andy Bronson / The Herald)
                                Don Thomas of R&D Handyman Service installs a ceiling fan at a home in southeast Everett. (Andy Bronson / The Herald)
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