yes, that's correct ...
that "doohickey" is the stop for the clutch-pedal. without it (or mal-adjusted) you will overstretch your clutch cable and if you're lucky, you'll "only" brake the cable, if you're not so lucky, you'll brake the clutch tube inside the center tunnel ...
the "black thing" is where your clutch pedal rod is supposed to hit the stop ...
btw. clutch stop adjustement (as well as throttle stop adjustement) is done best with 2 poeple, one in the back watching the clutch arm (working the throttle) and one adjusting the pedal stop accordingly ...
Andy