The picture was off the internet, and is a Spicer hub.
I have the same hub on a 1978 K20.
It has been a long time since I have been inside the hub, but I sure don't remember having two snap-ring grooves on the axle.
The only way I can think of that would prove that the groove you are using is wrong would be to turn the dial to unlock. Then see if it actually did unlock.
If it will not unlock you know you are in the wrong groove OR the plastic cam is worn out.
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Today's Featured Article - Harvestin Hay: The Early Years (Part 2) - by Pat Browning. The summer of 1950 was the start of a new era in farming for our family. I was thirteen, and Kathy (my oldest sister) was seven. At this age, I believed tractor farming was the only way, hot stuff -- and given a chance I probably would have used the tractor, Dad's first, a 1936 Model "A" John Deere, to go bring in the cows! And I think Dad was ready for some automation too. And so it was that we acquired a good, used J. I. Case, wire tie hay baler. In addition to a person to drive th
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