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If I understand your situation the aluminum is deposited on the threads of the bolt
If this is correct then there is not much drilling left to do. It might be fairly easy to finish up the hole and tap for the heli-coil as drill bits tend to "self center" when drilling through a smaller existing hole.
Heli-coil kits generally come with the drill bit, special tap, installation tool, and the coils themselves.
I have severe reservations about posting anything on this thread that would imply that the job is a "piece of cake" as I know in your case that scenario seems to be rare.
"Lack of empathy" by your potential female friend when you are deep into trying to fix something, at least to me, is a big "thumbs down" on any continuing relationship, but then I have not heard her side of the story
regards
mech
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