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That is just clearance between the Cotter and the Socket/Spigot. The Cotter pushes only one one side of the slot that it is fitted into, so there should be clearance on the opposite side to ensure this. "D" = the last two digits of the roll number, as shown at the bottom right. The image below is taken from https://www.youtube.com/watch?v=7sUjb-...


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