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I strongly advise against removing the arbor. You almost certainly will ruin the frame. Try to drill out the broken screw from the side opposite where you inserted the extractor. If you damage the threads in the frame that can be repaired.
An old trick from my automotive repair days is to drill out thread damaged holes to an oversize hole and cut threads in it. Install a new oversized bolt/screw using thread-lock compound. Cut off excess length of screw and treat the area as if it were virgin metal. Drill a new hole and cut threads for a new screw. This repair technique usually provides stronger-than-new results.
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