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Howard
Bump on this as I have rounded out one of the pinch bolts in a shimano chainset.
I have tried all techniques here and goodness knows what alloy the bolt is as it just rounded more and more.
The araldite trick nearly worked, but not enough.
Today in a last ditch attempt before cutting the bolt and therefore ruining the crank I will be bonding a larger allan key filed to fit the hole in place with milliput - an epoxy resin.
I'm hoping the stiff nature of the putty will take the rotation force better than the araldite.
I'll report in the next few days