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Wrong Bolt

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Steve has been around off-road trucks, both fast racers and slow crawlers, for many years. He pointed out that not only must bolts be the correct overall length, but they must also have the correct shoulder length. The bolts that came out of Harrington's front shackles were too short in the shoulder, leaving the shackle plates to pivot atop the threads. Since threads are actually notches in the round bar stock, this misplaced pressure can cause the bolt to fail given sufficient time and stress. Fortunately, the bolts were replaced along with the shackles and springs.