Ah yes, bleed screws are fragile little suckers. I have my fair share of broken bleed screws. I have come learn not to put too much torque on them when tightening AND loosening. If I feel a lot of resistance, I stop.
My suggestions is penatrating oil to try to get the rest of the screw to move. And use screw extractor twist it out. I have seen some people use heat to get the screw out but I try not to for calipers. Since you are refurbishing the calipers and they are off the car and all the fluid is out then it might be okay. Good luck!
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