How far should the clutch lever move when the clutch is pressed all the way in?

When is it time to rebuild/replace my clutch cylinders?  Any sure signs?  I
have had problems with my clutch since the dealer first replaced it. . .

One thing that bugs me is the "linkage" between the clutch slave cylinder
and the clutch lever seems to be missing.  It was never complete since I
have owned the van.  It was kind of home rigged, and I don't know what the
real setup looks like.  Pictures in the Bentley are pretty vague.  All
there is now is a steel rod pushing on the ball on the clutch lever.  I
don't have another van around to look at nor do I know anyone else that
owns one for me to get an idea from.

Any help would be appreciated, thanks already.

Gary Thaxter
74 transporter (panel)
85 Kombi
looking at an 86 syncro