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to the gasket surface and also tapped square. If you don't do this, the bolt will be a beotch to install. I end up rejecting cores with poor Helicoil installs all the time. Once it's crooked, the only way to fix it is with a Keensert, and it's just not worth it when there are so many cores that are not mangled. Here's a nice example of a crappy Helicoil install:
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