Trying to remember was it Green Satin where you had to use a long copper bladed screwdriver to tweak the Klystron. If you used one with a normal steel blade the moment you got close to the Klyston the magnet on the maggie would pull it over on to it's EHT, and zap you found yourself on the other side of the room.
Remember it well. We had the Command Heavyweight Boxing champion on my Fitters' Course. He achieved the above rather spectacularly, bounced off the opposite wall and came out fighting. The rest of the room moved out of his way even faster than NAAFI van call.
By the way, the little (and pretty useless) tail warning kit was Orange Putter (any other examples of golf related nomenclature?)