Gap between rear hub cases. Special is double the size of the Stone and there is rust
I would post photos but can’t see how . Yaay pictures ( Thanks Mike H ) Top picture is the Special and lower picture is the Stone.
Upload button in control bar…
I’m intrigued now! Want to see it. Can’t visualise what you mean (I also have a Special).
Thanks Mike H original post amended.
Thanks for the pix, I get it now. Will have to look at mine! Between the hub and final drive are the cush drive rubbers, so I’m thinking spray some silicon lube in there. (?) I’m thinking shouldn’t be WD40 etc. as needs to be compatible with rubber.
Edit: seems ACF50 is OK with rubber too so that would be preferable. Do not use WD40 as is 50% white spirit, apparently!
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Owners, on another furum, tell me the gap between the wheel and hub on the Stone is normal as is the gap on the Special. Something to do with the fact that the spoked hub is, of course, different to the cast wheel. I have never had a wheel off the Moto Guzzi before so I may remove the wheel and have a look. I can do that in the comfort of my garage with no time pressure.
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Yes mine is exactly the same!
I have soaked it with ACF50, which is supposed to be kind to rubber, so the cush blocks should be OK with it.
This parts drawing shows the item…
It’s a curved ridge or plate as a dust shield I’m guessing, and the drawing seems to imply it is permanently fixed to the casing. But why it has to be raw unprotected steel instead of part of the moulded alloy, I have no idea!
Note also the ‘U’ shaped cut-out at the top, no idea why, but it coincides with a plain boss on top of the casing kind of looking like it was originally to site a filler plug maybe.
So there you go. ACF50 is your friend. I don’t bother polishing the shiny bits on the bike, instead I periodically soak them with ACF50 then spread it around with my fingers, and leave it so it stays a thick coat. Has worked so far. Especially during winter. 
For ACF50 spreading I use a pastry brush ( I don’t bake) and an alternatve might be an oldfashioned shaving brush or at a pinch a well worn soft paintbrush. ( oh! dear the things we do eh?)
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That’s an interesting idea, I’ll try to remember it. 