@Floudas. You actually made me doubt the size i gave, so i went to the garage, stripped my X12 down and measured up the bearing only to find i was correct.
The actual size is 4 x 10 x 4 as first stated.
The end of the shaft is 3.175 (1/8th) but most call it 3.2mm. Maybe that's what confused your vernier. LOL
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