I know the CAP ( Cleaner Air Package ie Psyco California) carbs had them. there is a little set screw to the side of each adjuster ( may be covered with a lead plug - not sure about that)
I'm going to try the Alum method (thanks Tooljunkie, who will be held harmless if the worst happens:lol:) and see what happens. I'm not into this very much so if the worst happens I'm not out much. Wouldn't mind having an ultrasonic cleaner and trying that but car cash is tight right now.