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We stripped a bolt hole in an 8 hole flange on the body of our LWCO. We have a replacement and will replace the body but out of curiosity, and in the hopes of saving labor, we asked our inspector if a heli-coil would be acceptable to repair the bolt hole and he said no, unless the manufacturer provides a letter that says it is an approved repair. That seemed more labor intensive than replacing so we are replacing. I understand the liability but what do you think? Would a helicoil be an effective repair? I've used them on jet engines legally. The boiler is a 600HP. 150 psi max.