Are you talking about the tub shoe strainer in bathtub, if so it could be sawed out if you can get it from below, if not you will have to go to a Plumbing supplyhouse and buy a tool to remove it, I could get it out but if I tell you how you might chip tub, you could take a Dremel tool I think thats what they call it and get a cutting blade and go down in strainer and cut it out but you would have to get a new shoe to install a new one, maybe call a Plumber, might be cheaper.
Art retired plbg