i'm a machinist and i have literally done over 200 bolts this exact same way in this year alone. it works awesome though it is a little time consuming it beats the hell out of paying for the helicoil kit if you just drill the threads out. i make alot of money off of people that break taps, drills, and ease-outs. so do it right, be patient and just be careful, you'll be amazed at how easy it is once you get started. you can buy the burr at most equipment shops, a stone and a dremel wont last long


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