I have a leaky bath tub drain, that is leaking what looks like near the rubber seal. It has a lever that you pop up to fill the tub. I cannot figure out how to remove the drain, there is a screen that is blocking access to the drain. I cannot figure out how to remove this screen without damaging. I am assuming that when I do remove it, all I need to do is replace the plumbers putty around the lip of the drain. Any answers would be appreciated! Thanks!