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A Helicoil for a spark plug, wouldn't that be more prone to leaking?
I have installed the inserts a few times, the really good ones that come with a threading tool that screws into the original plug hole, cuts and threads the hole for the insert and a punch that expands the head of the insert after it's installed.
And the really cheap ones from princess auto.
Both work fine but the expensive ones threading tool uses a large socket 17 or 19mm which won't fit where the spark plug goes, luckily the owner of the kit let me weld a 14mm nut to the end of the tool and the princess auto ones don't have a punch area and the insert can come out with the spark plug.
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