Shimano Chronarch 150 MGL

I have 5 of these reels, I have been cleaning my own Curado's for a while. I'm searching for hints into removing the cover on the reel handle side plate. I'm wanting to get inside to get to the drag washers and clean them. I have removed all of the screws two on the outside and the one on the inside, that is all that I can find, but there is still something that I can't seem to find as to what is holding it together.

Right under the thumb bar, there is a small phillips head screw that is going into the black plastic rub plate.
I tried unsuccessfully to upload a pic.

Thanks, I'll look at it tonight.