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Another culprit is occasional partial bar nose kickbacks, in a plunge or just a mistake. They will kick the position of your bar, perhaps regardless of how aggressively you tighten the nuts. I believe this is the reason some bar installation instructions have you pivot the bar up as limited...

Any residual dirt will have a tendency to keep grinding your pin clearances. Seems almost impossible to wash out, but eventually the oiling cleaning action slows down the stretching. The metal itself is not stretching, its the precision of all the pivot points wearing away. IMO