Pin spanner is the tool I've used on freewheels. Some instructions I found for opening a freewheel for lubing it is where I heard it called a lock ring tool. Guess that's how I got to calling it by the wrong name. That, or just the general state of confusion I seem to exist in. It's the easiest way to get oil in, without giving the thing a bath. Definitely don't want to do a full disassembly, just open it up far enough to get some oil in.

My Claws quieted down, after I got some oil into it. My White was almost as loud as the ACS was new, but it's gotten quieter with use.