Inside the bellhousing, flywheel thickness is the big variable. Adding or reducing thickness (as illustrated by two aftermarket 'wheels) is the easiest way to change flywheel weight, so heavy ...
All together now: From the clutch pedal, upper clutch rod (A) connects to Z-bar (B). Lower clutch rod (C) completes the linkage liaison between pedal and release arm (D) that rotates around clutch ...