Chainsaw Repair

If they are not terrible you can heli-coil them or use a thread-sert. You can also step up the bolts to a M6 instead of the M5. If they are too bad for a thread-sert and the larger bolt then they can be welded in. I've welded probably 5 350 cylinders now.

Yes, a 346 muffler bracket with the one side that should bolt to the case front cut off works well to keep them on. Also, I've just used high temp RTV on the bolt threads and gasket surface and that keeps them from rattling out.