you seem to have also missed thread depth specifications, and basic math.

instead of engineering.. take Machine Shop Technologies next time.

it covers most of what Mechanical Engineering does, plus it applies the knowledge to real world situations and materials

do you know the thread pitches involved, yet?

heli-coils are great at tensile loads, but terrible for pivotal load resistance... they chisel into softer materials.... and they require an interference fit on the external threads.