The size is M12x1.25. Drill bit size is 31/64. Just drill, tap, put in the coil and your back to new. But practice makes perfect so at least try it a couple of times on something else first. You can buy a helicoil kit from your local hardware store, auto store or even eBay. If you need any help along the way just post up your questions and someone will speak up. Good luck.
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