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As long as drilling for the upsized tap doest get too close to an edge the helicoil will be stronger than the original hole. Question is why are they pulling out though. Brake rotor material is pretty low strength but if you have 1 diameters worth of thread length you should have been fine. 1.5ish ideally. Are the female threads failing or just loosening? If the latter, may go full red loctite into the rotor. If they are failing probably deserves more careful consideration
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