My idler pulley went out today and it looks like the bracket hole was stripped, what is the best way to rethread the hole?

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The correct size tap should clean up those threads

 

Adding on to the other person. That's an M10 bolt that goes there. Depending on the tap you use, you can make M10x1.25 or M10x1.5...Just be careful because that mounting point is aluminum and it's a lot easier to thread than steel. So just make sure it's straight. Because I threaded mine and made it crooked.