I've been trying to get to the cartridge in my bathroom sink faucet handle. I took off the top part, but in order to get the cartridge out it looks like I have to take off the bottom part as well. I've tried prying it and turning it, but I'm not sure how it's supposed to come off. I don't know the manufacturer of the faucet either.
I put WD-40 to help loosen the bottom edge but it doesn't seem to want to budge and I don't want to scratch it up. Any suggestions? Also, do I need to replace cartridges in both handles to stop a leak? I'm new at this house fixing stuff.