They typically don't break too far down and they generally are not hard to twist out, if they break off flush or just below flush I take a cut off wheel and cut a slot in it (might get the head a little bit so make sure your not aiming your slot toward the port or you'll make another leak path) so I can use a flat tip screw driver to unscrew it. The screwdriver it's elf I will make super flat with a stone of some sort so it bites into the slot real good as the slot comes out slightly rounded in the bottom.