We own a MOEN kitchen faucet. The only number I can find to identify it is on the back of the faucet: A112181M. The faucet is an all-in-one faucet with the handle on top and a sprayer/faucet combination under the handle. The handle has become loose and there does not seem to be a way to tighten it. Are there instructions online or an exploded view of the faucet that could help? Thanks in advance for your assistance. Robert Freeman