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However on no account should this backing off be done when drilling the pinkish 'drawn bronze' - this really work hardens and gets hot extremely quickly and can seize a drill to the extent it's virtually withdraw-able. Reaming can be just as fraught especially if a deep hole. Drills should be very sharp, preferably freshly ground, and the hole opened up in small stages rather than just a pilot and opening up to size with this material. If like me you have no flood coolant the action of seizing is extremely quick and even with it it can happen if a deep hole. Again, because of this characteristic rather than reaming I would finish by boring if possible. Regards - Ramon