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Safety wire is used to keep bolts and nuts from coming loose and falling off. You simply wire the bolt or nut in the tightening direction so that any time it may try to loosen itself, it is pulling AGAINST the safety wire. Two bolts or nuts can be saftey wired together so that if one bolt or nut trys to loosen itself, the safety wire actually tries to TIGHTEN the other bolt or nut, thus preventing the loose bolt or nut from backing itself off. Safety wire is used EXTENSIVELY in the Aircraft industry. It SHOULD be used more widely than it is. Easy way to prevent accidents/catastrophies. IMO.
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