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Finally had time to sort that out and it was definitely a matter of dust cap removal (that seems so obvious now - almost embarassingly :). Actually hese dust caps's seals are prone to deformation (not surprisingly considering their age) causing dragging and making cup and cone adjustment a nightmare, just as i experienced. A light grind on the seal's rubber's inner diameter works wonder. Bearings were the right size, as Campy documentation available confirmed (parts catalog for 1994-95-96 came in handy).
They're back to life !

Hello i dropped you a PM :)

Hi, 2nd dibs on the DA shifters please

Thanks @cycleclinic. Didn't think about a wrong cone, but it could be as they're second hand, will check that as well. I was convinced the hole was an oil or grease port (why drill a dustcap then ?) but it comes from internet researches not old days mechanics, so this may be wrong of course. Maybe a sort of exit for grease / oil excess when the wheel is moving ? Cheers.

Thanks. Good to know about the Campa peculiarities, will definitely double check and cross reference with as many sources as possible.

Hi again, i'm suddenly wondering wether the bearings balls size i found in the hub are the right ones (i got the wheel second hand) : 9 x 7/32 on each side... Same as 70s / 80s Record iirc. Does that seem alright ? Cheers

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Thanks. The mandatory cap removal makes total sense i guess.
And yeah i had read somewhere they were C-Record, thanks for confirming this.
This should help me a lot ! Thanks again.

Thanks. The oil port actual utility has been regularly questioned... some say it was used in the old days on very precise situations (minutes before a time trial for instance, to get optimum bearing lubrification over a short period of time).
Never dared to remove these things, but will try !
Do you have any advice on the cone nut adjustment with that type of depth ? > look on this vid at 1'29'' to know what i mean (no room for a cone wrench isn't it ?)
https://www.youtube.com/watch?v=4othSZTwboI

Cheers

Hi, yes it's the circular part with the small hole in it. It's a regular feature on Campy hubs (on the higher end) but on most older models it's thinner than this one and don't really add hub depth like this one does.

Hello,

I'm currently servicing the bearings of a 1995 Campagnolo Shamal front wheel (first gen.) and face a couple issues.
1- the point where the cone nut is properly tighten is so deep into the hub that you can't reach it even with the slimest of cone wrenches, making the bearings ajustment almost impossible.
2- on one side, the oil port is rotating and moving up and down (still attached though). I've never seen a moving oil port on Campy hubs and i'm wondering wether it should be fixed (and how ?)
3- the axle seems very short (it's the original campy though) even with the cone nut threaded deep into the hub.

Any help regarding one or more issues would be greatly appreciated !

Cheers