Chainsaw Repair

I bought my last left hand bits @ Autozone $6?.  Another option is lay a nut one size smaller on top of broken bolt mig/tig inside nut, remove w/ wrench.  On smaller stuff put use a washer slightly smaller tack then weld nut to washer.  Am going to use the last method on 359 muff.   Kid that was helping me broke e-z out off in muff support bracket hole (5mm bolt) me telling him don't pull too hard you will break it.  2 breath's later I heard him cussing.

Shep