broken bits

[calm n sedated]

Clyde, is it full carbide or just carbide tip? If it's a tip and the shaft is hss, grind it or bore a flat surface on the fractured end. Next tap it or just drill a smaller diameter hole with a full carbide bit and lubrication. Now back it out with an extractor. Worse comes to worse you may have enough space to spot weld a rod to the flattend end of the bit or the hole that you drilled into the fractured bit and crank it out.