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  • For tight-and-loose points, try loosening the chainring bolts a little, but not totally, so they're still biting a little but so that you can tap the ring and move it a little. Spin the cranks until you get to the tight point, then knock the ring towards the back wheel - sort of truing it, but with where it's held. Then tighten the bolts up again. Might work.

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