Before I insert a longer bolt and hammer on it like some kind of roofer, can anyone confirm this is a wedge-type ECC and that I'd be doing the right thing to hammer at it?

From searches and other sites, I'm 90% sure I'm okay, but would prefer a little support first. It's the stock eccentric on this 2004 Trek T-2000. By the way, is there a special tool to remove the small aluminum 'lock nut' or whatever it's called? The notches are too far apart even for my largest screw driver.