[rodneym]

Bill,
You have pics of a black and unpainted slave. Did you go through one already?
I know this part. It's a GM/Isuzu part that Superformance installers seem to be fond of. It used to be made in USA, believe it or not. Now, China. They have good travel and they're cheap (~$15) but I eventually went with a CNC slave.
Good that you removed the spring. Mike Forte doesn't like pressure against the clutch, and when I made sure there was no contact (via return spring), the semi-frequent squeals went away. Some say the Mustang style contact is the way to go, but taking Mike's advice is what did the trick for me.
Using this setup "as is" has been a part of some mysterious issues for some.