The best solution is an autobody dent puller, it is a small slide hammer with a screw on the end that you will thread into the plastic in the center of the magnet, second best is to use a 3" #10 deck screw and pull and twist it out with vice grips, you may need a friend to hammer on the vice grips and help pop it out while you hold the pump over the end of a bench with a soft cloth under it.