I recall in a Rick Ehrenberg article he said you need to install a pedal stop when switching to a diaphram clutch. He stated you can over extend and damage the clutch.
That style of pressure plate does have a shorter stroke so a down stop is a good idea.(actually a good idea for any clutch) I have seen some pretty nice adjustable stops that people have fabricated. I used a chunk of 2X4 under the carpet for years.
In theory, there is no difference between theory and practice. In practice, there is.
