Helicoil works for permanent bolts that don’t get removed frequently, such as case or head bolts. But repeated use will have helicoil fall out. A permanent insert works much better. Such as bolt-in-bolt solution above, or next-size-up insert.
https://www.amazon.com/dp/B01MEFKNX4
Note this is for autos. Find one with Njnjette threading. Time-sert, Ez-loks and other one-piece inserts always better than helicoil for most apllications