s86d

wondering if anyone else has tackled this and has success tips. I bought my S14 back in July and just switched the open diff to J30 but when I swapped it I noticed only one bolt was installed. Tried to put a new bolt in and it did not grip at all :-( has anyone (helicoiled or time sert?d or retapped to M14) this bolt before. I’m leaning to time Sert as it’s a higher torque please don’t fail and have my diff drop while driving mount. Thanks

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Been doing this so long... I am now building a father son 240...