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There are other options of repairing failed threads .One used by Roush racing as well as Ford Motor company is Time Serts .Unlike a heli coil these things use a forming tap to deform the internal base threads which provides an insert that can't back out .Roush installs them on every Ford engine...

I may be mistaken but if memory serves you use a Stihl 056 bar stud which is 10 mm on the saw side and 8 mm on the bar side . # 1115 664 2405