trying to winterize my pool, trying to drain the filter, took off the external black plastic cap, inside is a white plastic plug, with a plastic cross pattern that looks like you should flip over the black screw on lid, and use that to unscrew the white plastic plug. The plastic in the white plugs "cross" pattern is thin flimsy plastic that broke. tried various pliers to grab the internal plug all just broke the flimsy plastic "cross" worse, now I've got a plug in there and I cant figure out what to even try to use to get it out so can't drain the filter... any ideas?