Hugh the way the water level diaphragm works is when the spin tub is full of water, it starts to overflow, after four or five gallons of water has overflowed into the outer tub, the weight of the water presses the rubber diaphragm down which starts agitation.
Jimmy, on my white 1958 machine I did completely rebuild that 1960 transmission, including changing the oil. A GE tranny takes some 65 or 70 oz of oil, about three times the amount of a Whirlpool or Unimatic tranny. So before I even consider doing that again I want to make sure one of those spare transmissions will work. Since the GE transmission only swirls the oil around and doesn't pump the oil through channels it should be fine as it is.
Allen there is a thread started about the TV show in the Super Forum.