potential need to resize J2 spindle set screw hole

Hi all, per my last post I had to unfortunatly drill thought the M3 set screw within the spindle to dislodge it and managed to not rough up the threads of the spindle too much but of course some slight repair and even resizing may be necessary. I need to take a trip to my school shop to asses the condition of the threads but if theyre too bad to re-tap, would I be able to size up to an M4?