Recently, I did an overhaul on a front wheel built with an HB-7800 hub
↑(Italian-style lacing, so) the notional left side looked like this
↑and the notional right side had something corroded on it.
The integrated cone shaft is on the notional right side
and the adjustment side with the double nut is on the notional left
↑left side
↑right side
They look like this respectively.
With this hub, parts are unobtainable, so complete repair is impossible.
I check regularly, so I'm certain, but
the cone-related parts—going by complete wheelset generations—
the 7900 series is barely obtainable, while the 7850 series and earlier are discontinued.
Using the 7900 shaft (image, bottom)... doesn't work.
The ball position (the distance between the cones inside the hub shell) is different, so it won't fit.
In this case too, since there's no pitting on the hub-side cones,
just being able to replace the ball race on the locknut side makes a big difference in the outcome.
The HB-7800 came out in 2004,
but since its counterpart rear hub is the FH-7801 (minor revision for rear only),
it was probably actually built in 2005 or 2006.
2005—if it were Mavic, that was the silver Ksyrium era right before ES,
if it were Fulcrum, that was their debut period,
but those wheels have parts available and can be repaired.
When DURA-ACE was called Duraace,
it was supposedly "Dura" from duralumin,
but in recent retroactive lore, the "Dura" in Dura-Ace
comes from durability.
Ending support before ten years have passed suggests
that the lifespan the manufacturer assumes for Dura-Ace itself
is about that long.
So this time, I got by with cleaning and regreasing.
The cones and balls on the hub side aren't that worn.
Bonus
The 7800 series is the only Shimano road rear hub
with a bearing on the right side of the hub shell.
It looks just like a Campagnolo hub.
↑(Italian-style lacing, so) the notional left side looked like this
↑and the notional right side had something corroded on it.
The integrated cone shaft is on the notional right side
and the adjustment side with the double nut is on the notional left
↑left side
↑right side
They look like this respectively.
With this hub, parts are unobtainable, so complete repair is impossible.
I check regularly, so I'm certain, but
the cone-related parts—going by complete wheelset generations—
the 7900 series is barely obtainable, while the 7850 series and earlier are discontinued.
Using the 7900 shaft (image, bottom)... doesn't work.
The ball position (the distance between the cones inside the hub shell) is different, so it won't fit.
In this case too, since there's no pitting on the hub-side cones,
just being able to replace the ball race on the locknut side makes a big difference in the outcome.
The HB-7800 came out in 2004,
but since its counterpart rear hub is the FH-7801 (minor revision for rear only),
it was probably actually built in 2005 or 2006.
2005—if it were Mavic, that was the silver Ksyrium era right before ES,
if it were Fulcrum, that was their debut period,
but those wheels have parts available and can be repaired.
When DURA-ACE was called Duraace,
it was supposedly "Dura" from duralumin,
but in recent retroactive lore, the "Dura" in Dura-Ace
comes from durability.
Ending support before ten years have passed suggests
that the lifespan the manufacturer assumes for Dura-Ace itself
is about that long.
So this time, I got by with cleaning and regreasing.
The cones and balls on the hub side aren't that worn.
Bonus
The 7800 series is the only Shimano road rear hub
with a bearing on the right side of the hub shell.
It looks just like a Campagnolo hub.