My bathtub has an Eljer faucet and it drips a lot unless I really tighten the handles. I was told I could probably fix it by replacing the rubber washer in the handles. However, I cannot figure out how to get them off. I've attached a few pictures of them. As you can see there is a small slot that looks like it could be pressed down with a flat head screw driver. I've tried pressing it in (barely moves) and pulling on the handle...nothing. Any advice?