Have you tried Arighi Bianchi?
Might nip in tomorrow.
Hig's so far you are in the lead for "slightly odd but very specific request thread" prize ahead even of the “Geologists hammer” thread
I find there's not much the hive-mind of STW can't answer (although it came up blank re restaurant 'La Popote' the other day). Must have a look at the "Geologist's Hammer" thread – I don't think my brother's swung his in anger since becoming management some years ago.
If the rod and balls are solid then how did the last guy get the rings on (discounting magic). I can't believe he put the rings on and then welded it up.
Looking at it it does appear to have been welded up with the rings in place. But if it helps you to believe in magic….
You normally can't put passing rings on the pole directly
Nigel (Mr Overshoot) knows I have the skills hammer needed to get them on the pole.