This is the faucet in my kitchen. It drips, so I'm thinking it needs a new cartridge. The problem is that I have NO idea what brand it is. There is no name on it anywhere. It looks like I'll need one of those vendor-specific wrenches to remove the cartridge. So short of taking the whole faucet out and taking it to a plumbing store, how do I identify it so I can get the right wrench?