The valve itself is not leaking, but there is a steady drip from the far end of the line leading from it. It seems to actually drip more, the more I tighten the valve. Is it possible that the piercing pin has made a whole too big and when tightened all the way, it can no longer "fill in" the hole to stop the water flow? The valve is quite old, so I don't mind replacing it, but do you think that even a new valve placed over the old hole will have the same problem? Thanks.