helicoil only about 1 - 2 mm thick .
other option retap hole then get or make some threaded alloy bar to fill hole (loctite in place) re tap to std size

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Buell Ulysses XB12X 06/08

One thing I hate in life is disappointment, anyone else's just as much as mine.

I think I should shut up and get on with something else and let nature take its course...

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08 Specialized Langster

Really appreciate all the advice guys, I have found a man that is gonna sort it , like Nick advised he is either going to weld it and tap again or use an aluminium insert and tap that to correct size. Hopefully it works , if not - new head . Gonna chance it anyway , he seems extremely confident it will work. And he will re machine face for mount