Hi. I have a Moen kitchen faucet that is missing the aerator (bought home with it) and what is at the end of the spout has no threads. There is a piece that comes off the end of the spout that 'clamps' onto a lip on the spout. Does this get replaced? I would like to install an aerator and/or water purifier to the faucet but cannot because of this issue. Can this be rectified or do I plain old need a new faucet? Please advise. Many thanks in advance! :)