[Healeys] servo

[healeymanjim]

put a rebuild kit in my girling servo and cannot get it to work correctly.  have had it out four times now and cannot find anything wrong.  bellows moves smoothly, good vacuum, nothing hung up inside, valves appear to operate correctly, etc.  have rebuilt more than a few of these things and never had this kind of problem.  usually it is the foam rubber too thick that was hanging up the bellows, but not the case here.  anyone ever had any case like this.  ideas?