Found this via your link.
There is nothing new under the sun.
This could well be posted in Tech Topics, in any of the rear axle, wheel bearing, needle roller ring threads:
The blacksmith’s part is to fit the bearing and band both ends of the nave with iron to protect and strengthen it; .... From time to time, and for various reasons, these rims sometimes had to be re-fitted, or renewed if worn out.
“The wheel (was then) laid on the ringing bed, where the centre was filled with water, with four pailfuls nearby. We had three ‘Dogs’ for prising the (red hot) ring on to the wheel. We employed little hammer work except to centre the ring. Owing to the length of my arms, I had the job of cooling the ring after the pailfuls had been applied.
“Allow me to write, father and I were expert at removing the whole red-hot ring from the furnace, taking it through the smiddy door and placing it perfectly on the wheel. Being a new wheel, both sides of the nave had to be rung, and of course the metal bearing driven in to an already made hole in the centre of the nave, to fit the axle on the cart.”
Rob adds: “The Blacksmiths’ Association held meetings at Inverurie, where the price list (for commonly occurring items of blacksmith work) was made up. Father attended.”
Few country smiths carried out the tricky ringing operation often enough to become casually perfect at it, and it was always an anxious moment when the ring was fitted, as news of a failure would soon do the rounds, and could damage and perhaps destroy the smith’s reputation for competence.>
These boys would be right at home with the Guzzi rear wheel axle / spacer/ bearings / inner ring technicalities. The onlr real difference is that the Guzzi requires the employment of much more 'hammer work'. The Blacksmith's Association could easily be the MG Parts Suppliers meeting at Mandello, except that there, the prices really are 'made up', i.e. plucked from the air in the most ludicrously extravagant fashion. As for the 'reputation for competence' being destroyed: well there can't be any connection with that one in relation to our modern-day Guzzi counterparts. Can there?
Isn't it nice how the bloke added the little, personal, human-interest story? He must have had arms so long that when he picked pieces up he couldn't then put then in place because his hands were about 10 feet away. So he used his arms as a human windmill / cooling fan instead. Sweet.