I have ordered a new clutch cable, so I removed the old one today, but this raised a question, is this cover meant to come off.....

as I can't move the screws at all.
So I removed the whole sprocket cover, the inside of which was covered in some kind of baffle, so what is behind that small cover? while I had the sprocket cover off I thought I would strip and grease the actuator assembly, yeah right, I have really tried, and I can't shift those two mounting screws either, are they meant to be that tight, are they locktighted?