Originally Posted by namba209
Bob, if you have a dremel with assorted collets, or something similar, I can send you a rotary file that went through a tap thet I broke off in Willit?'s exhaust bolt hole. It took about 15 minutes to get the busted tap out. Send me a PM with your address and it will be in the snail mail post haste.
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I don't have a Dremel Ron, but I have a Foredom 1/3rd HP electric die grinder and a selection of about 30-40 carbide burrs. It would still take forever to grind out that way, I feel safer milling the broken tap out on a Bridgeport to avoid possibly damaging the threads in the ring gear.
I did the same thing when I broke a cobalt pilot drill off in the fuel rail I was making for this car. Simply milled it out with a carbide end mill, took 30 seconds!