How do I replace the cartridge in my Moen 7065 Vestige Single Handled kitchen Faucet?

First the water needs to be shut off, then with an allan wrench if i remember it should be 1/8. the allan screw is located in the handle. remove the screw completely and under the handle should be a nut, with a crescent wrench remove the nut and the cartridge should be ready to be removed. it is going to be difficult to come out with out the proper moen tool but vise grips will help as you have to pull straight up. if you find a plumping wholesale and give them the model # they should be able to give you the right cartridge. or if you call moen the will ship you one either way it should be free as that is a warranty item.