Nub on clutch cover

[MatthewAES2004]

What is this rubber peice on top?

And what is this nub with a rubber cap on the side?

Also these aren't my photos I found them online, but I just got my blaster and am curious.

 

[TypicalGuy]

I too am curious about that nub with the rubber piece in it. I have so many other things going on with my project I never cared to look in to it lol. Got to get the big things out the way first

 

[Larry's Shee]

The clutch cover is also used for the DT/DS water cooled enduro. They remove the block off when casting it.
I cut mine off and filled it with JB Weld before painting. Smoother look