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It can be done. What Im getting at.. While your drilling, your hand will move a bit. When that happens the drill bit moves and makes the hole egg shaped or however it happens. When you tap for the heli-coil theres less thread in that area, which allows the end bolt more room to move/wobble.
If you have the heli-coils a smaller shop with some manual machines would probably get one in there properly for ya, around $50 or less. Money well spend considering if you DO mess it up at that point you will be in for an expensive repair or a new head.
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-Ryan
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