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It's tricky to fill deep recesses like that. I don't think i'd attempt it for fear of ending up with an air pocket in there, it's difficult to get enough current though a super extended tip, without losing the end of the tungstun.
FWIW, A properly installed heli coil is stronger than the origional thread.
If you don't like the heli coil options, have you considered tapping the holes to the next size up, and using larger studs? Might be a 2$ solution, and it'd also be stronger than new.
Paul
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