Re: Rod alignment
One of my professors in engineering school told us a story about the meticulus aircraft mechanic aboard an aircraft carrier during WWII. He would paint the tips on prop engine planes white. In order to make sure the edge of the white was neatly straight he would scribe a line into the surface of each prop. Soon thereafter they began to experience the loss of a large number of planes due to prop failure. They determined the scribe line created a high concentration of stress which ultimately cause the blade to fail.
Similary, a more familar phrase to many is "tear along the dotted line".
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