Thought I'd give this one last try to repair stripped threads in an aluminum head on my Toyota Tacoma!
This truly works amazing!
Some tips: make sure you have a vaccum or way to blow out the metal shavings that will drop onto the top of your piston. I used a snake camera before and after and could see the metal shavings very clearly... So it's critical you can get those out! I used a shop vac with a McDonald's straw :)
Also don't forget the red lock tight... If you don't use this the entire insert could back out next time you try to remove the plug.