Thats cool. Jempson your right with what the stub axles are.

Dodgeman is the part that you refer to a spindle the same as what we are calling stub axle? If so I dont think they were the same size, as I once fitted up the 120Y disks off my old 1200 ( the smaller 120Y disks, not like the stanza ones) onto my 1000 stub axles and I remember having to use the 1000 bearings in the 120Y disks as the centre race of the 120Y bearings was to large in diameter. Also the 1000 stub axles were only just long enough to spin the hub nut on but not near far enough to fit a split pin through.
Could there quite possibly have been a few sizes? or are the measurement you are refering to actually the outer race sizing of the bearings and the hubs?