Old shower diverter spout. No allen screw at all. I got the spout off because it was corroded through. Had to saw off the pull handle to do it. Now I have the plastic piece that mounts to the pipe on the pipe (still no set screw). OK when I rotate it counterclockwise it still won't come off. Its loose on the pipe like there's rubber holding it on and I can't pull it from the pipe. Help!