I'm not sure there is a minimum disk thickness. Go until you run out of adjustment. If they are down to flat with the grooves and you still have adjustment, I suppose you could cut the original grooves a little deeper. There is still pad where the grooves are.
New pads are a hair over 1/2" thick. Maybe close to about 9/16".
If you got adjustment and pad left, I'd say your lucky. Those actuators only spread so much. At some point new pads won't work and you have to machine off some of the housing surface.
Part of the reason it may have broke (maybe) is that you are out of adjustment. The two actuator rods from the clevis to the disks pull tight against the housing as you adjust the ball up too much. Then the actuator disk spread has reached its limit. You will see that when you get the housing off. Let us know.
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Today's Featured Article - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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