From the "For What Its Worth" department; When I replaced the clutch slave cylinder I found the bleed nipple to have a longer grip length than the one it replaced. The result was a sloppy fit where the spring attachment tab fit against the body of the cylinder casting and less tension on the clutch lever return spring. A couple of thick washers fixed the problem. I know that some may use a substitute spring with less tension or don't use one at all, but is my understanding that a strong return spring will keep the throw out bearing from constant contact with the clutch diaphragm.