One of the most frustrating things about the clutch slave is trying to get it out!  The nut and bolt nearest the engine is a project in and of itself.  So, when I had my transmission out for the umpteenth time, I had a nut welded in place on the underside.  When I went to reinstall the clutch slave, it took only a couple of minutes.   If you have your transmission out for any reason, have someone tack-weld a nut under there for you.  You will be glad you did.

Warren Lail
88 Westy "Billy Bones"