[Lynn Eades]

Just to add to Jordans comments;The fan extention fully carrys the fan. The extention has two bearings and its own axle like shaft. It is driven by dogs, and a fibre coupling much like an old injector pump.The pulley is part of the fan extention assembly, and therefore the generator bearings carry no side loading, other than the weight of the armature.
There are not many English or Canadian carriers in Australia,and Aust. carriers use a different set up.