Mechanics and Fixing Any Questions Answered

Sorely tempted.

Yeah I'd say keep one end of the ring steady with something and try to push the other end away from it. Sort of opening up the ring. A pair of little picks would be useful. 2 small screwdrivers maybe? It's a bit of a pain. I think I had the same hub on a Campagnolo some time ago.
Oh and it'll probably go flying

Probably, depending on the hub various bits will pull off (although they'll be seized because they'd have been installed dry ages ago) unless there's either a 5mm Allen in the centre of the axle or some spanner flats in which case undo stuff. That hub looks like the axle runs right through and the cap and the silver and black but should remain (but may not) together and pull off, a round axle vice helps. Then twat the axle through with a hammer once off. You might have more luck supporting the hub shell and twatting the axle to start with if it's made up like I said it might be and then separating everything.

Looking at the zoomed in one maybe the axle doesn't go right through, so the hammer may help you feel better but may not help you remove anything.

You're no fun tonight.

It did go flying, but fortunately I've located it. Now what? Nothing seems to want to budge despite me having removed the snap ring.

Blimey, I did it.

Now all you need is the bearings and a fancy press to install them correctly.

Or twat the cunts back in using the old ones as a drift.

Presume these are hen's teeth rare, like?

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Nah fam, standard AF.

6001 is the size, the rest is the seal, in this case 2 rubber ones.

Thing is, they seem fine. Fairly smooth running. Just that there's some play in the axle and I can't see new bearings changing that.

This kind of thing do the trick? Hilariously, there's a drop-down list of sizes that I now need to identify as the right one.

E2a: think I've worked that out on my own. Amazing.

I would try new bearings and see what happens, there's a small chance one of them has worked it's way outbound and that's the play, find a socket that fits the outer diameter and twat both sides whilst supporting the hub shell opposite, but worn bearings sometimes have play rather than feel like shit.

Try Wych Bearings. Get a decent make like SKF with 2RS seals.

They'll be the right size, better ones might well be worth it, enduro or a decent Japanese brand like SKF, you're probably hoping not to do this too often and they're not much more money.

I haven't figured out how to get the old bearings out yet.

Hit the axle with a hammer, ideally with a slightly softer than aluminium head with the hub shell resting on something slightly softer than aluminium.

You mean leave a disposable QR in the axle and then hit it with a hammer? Thank me later.

Nah, just use a hammer with a soft head designed for exactly this kind of thing.

Hammers have soft heads? What is this?

You're assuming a home mechanic has one? ;)