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Helicoil Sav-A-Thread or

KD Tools Plug Rethread Kit - http://www.kd-tools.com/2125.htm

I've used both, the KD Tools kit tends to be more available from automotive parts stores, Ace Hardware may stock the Helicoil kits.

Helicoil taps the hole larger and you insert this spring coil.

KD Tools taps the hole and you insert this threaded tube. The kit should include a sort of thread locker compound for use on the outer threads on the tube. Once in a while, the insert will come out with the sparkplug when you replace it.

Make sure you get the proper length inserts to match the thread length of the spark plugs.
 
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