Anyone have any tricks fro removing a plastic threaded drain plug that the head broke off of? The plug on my Hayward chlorinator broke off at closing in the fall. Now I need to get the remaining portion of the plug out to install a new one. I tried drilling a hole in it and then tapping with a screw driver with no luck. Also tried sticking a pair of needle nose in the hole, opening and twisting. No luck either. Any other suggestions?