Hi I tried the simple task of replacing the tub spout. It has a set screw which I removed, but I cannot get the spout off the pipe. I can actually unscrew the entire spout from the inner plastic adapter piece that is on the pipe but the plastic will not budge and I don't want to damage the pipes. Tried spraying some wd40 but I think it's too tight to even get in there. Any advice? Any trick I can try? Thanks!