If you have a bathroom faucet and there is a constant leak, this short video will show you how to easily replace it cartridge. Whether it is a hot or cold cartridge, they both are replaced the same way. Watch and see how easy it is!
I watched a lot of these videos showing the cause of the drip had to be a bad cartridge. I ordered a new cartridge from a "plumbing supply store", it was the correct make, but they gave me one with a 1/4 turn. It didn't not line up with the faucet handle! Being I was fixing one side; I also bought a new spring kit for $2.99. So, for the heck of it, I put that new kit in and checked to see it the dripping stopped, it did. Don't always assume it a bad cartridge!