Stripped Threads; Helicoil or M7?

Seth B /
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So I was going over a couple bikes I rebuilt last year, double checking things and re torquing and such. As I re torqued the head nuts on my Gila e50 Free Spirit, the last stud stripped the hole in the case. I only torqued to 108 in/lbs using a Mac torque wrench, so it shouldn’t have stripped. But it did, so now let’s fixit. I’m thinking the BEST repair option would be to drill it and install a M6 Helicoil. Is that the best practice in this case, or should I drill & tap to M7? Either option I have to buy the stuff to accomplish the task.

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