Screw Extraction Help

Hey everyone, novice woodworker here. I was recently gifted an arbor that my wife and I use it our wedding seven years ago. I am trying to take it apart and refinish it because it hasn’t been taken care of. I am able to unscrew it, sand refinish, and put it back together. I am having issues because three screws broke inside the holes.

I am just asking advice on the best way to extract these screws. I have provided pictures so you guys can see what I am dealing with. Thank you so much in advance!