So I reread the relevant sections and I think the retaining pin now makes sense me. Does it keep the centring pin from dropping down into the axle? Once that retaining pin is out the centring can drop down and the centre ball can now fall out. Initially I believed that the retaining pin actually held the centring pin in tight. This was my confusion.
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Jordan Baker
RHLI Museum,
Otter LRC
C15A-Wire3, 1944
Willys MB, 1942
10cwt Canadian trailer
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