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Spark plug blew out of head

(1990 Mazda Miata MX-5)
in Lancaster, NY on June 26, 2009
any options short of a machine shop, heilicoil, loc-tite?
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Popular Answer
on June 26, 2009
Yes, I have had a lot of luck with a product called Thread Cert ( I believe this is how it is spelled ) It is much more robust and sturdy than a helicoil. Be sure that you have the skill to drill out and re-thread your spark plug hole, because you only get 1 chance. The next step is usually a new head, if the re-threading does not go well.
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