I have been having a problem with my shower diverter. A strong stream of water flows out of the tub spout when I turn the diverter stem to the right. However, when I turn the diverter to the left, water comes out of the tub spout and the shower head. I suspected that something is not sealing correctly. I removed the valve and the valve seat. But I could not determine the cause of the problem. I did remove a couple of small pieces of an old rubber washer/seal from around the valve seat. However I could not tell it was from a seal that is suppoed to be around the valve seat or some other area. I could not see any other problems. Am I missing a seal or is something blocking the valve from sealing properly? Any help is appreciated.