down in order to do this. So in the training video they did this with their fingers which may be possible in a brand new unit that's never been used and hasn't been there for a while but I actually found that I needed to use a pair of pliers. I used some rubber tip pliers because I didn't want to damage this thing. There is a hex on here so you might need to put a tiny little wrench on there to undo it as well. I'm trying not to drop it down the drain because there is the potential for dropping screws down the drain. Anyone just put some toilet paper down there just so that you don't lose a screw. So in many cases I find that this trim ring is really hard to undo unscrew. In this case I actually locked out it was pretty easy but sometimes this is the hardest part to remove. You have to make sure everything's really dry and clean. This is where maybe one of those little rubber mitts that you might have for opening up jars in the kitchen might be helpful to remove this little trim ring. Because you don't really want to put pliers on here because you don't want to damage it too much. And again in the video they show putting your fingers back behind the trim ring which is obviously impractical in an installed situation. So I'm probably going to have to get a screwdriver or something to get behind it. Okay as expected I need to use a screwdriver to get behind it to kind of work around. Okay so now that I've removed the brass ring I need to pull out the cartridge