I don’t have close the skill set as Robin, he’s a professional & I’m a hobbyist, but I agree with his statement.
I’ve never been a fan of helicoil. Unless it’s a must. Either drill & tap to to the next size, or if the smaller size must be preserved there are steel screw sleeves, like the EZ lock. Of course there is always doing a fill weld & re-drilling/tapping to 1/4-28.
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