[Excaliber]

Opinions on this tend to vary, but in MY opinion yes you should. You need a little bit of clearance so the throw out bearing is not resting on the clutch cover fingers, and thus continually in motion, while at cruising speed. This is the same reason many people say, "Don't ride the clutch." If the clutch is tight ALL the time (no spring) you won't have to, it will automatically "ride the clutch" anyway!

...put a spring in it.