cold water is leaking from the tub spout. I removed the handles replaced the stems. Water still was leaking. Removed handles and stems again looked closer inside and there is what looks like about a 1" pipe bringing the cold water up but inside that is a smaller pipe about the width of a straw, it looks like the end of that pipe might be a little chewed up, that also would be about where the rubber end of the stem would sit up agaist. Assuming thats the prob., can I sand that smooth? thanks in advance for any help!