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The 3N70 and 3N71 tended to crack their cones early (too thin) while the 3N80 worked like a dream for ages. I don’t know whether the 2N70 used the same cone design as the 3N70.

Mostly Shimano dynohubs used here with only a couple of SON. Value for money is right up there, as long as you back off the bearing adjustment a shade.

Each cog will only fit one way round because one of the splines on a SRAM cog is wider. The cutaway ramps face outwards.

No, 28 hole

Replace. The plastic sheath holds the longitudinal gear cable casing strands in alignment. Without the plastic sheath’s restraint all the way round, you get excessive deflection and bad gear changes.

Clamp-on cable stop?

I attended a Pedal Club lunch as a guest of the much-missed Rocco Richardson some years ago. The setup sounds like it might be a bit stuffy but it was actually good fun with interesting attendees and speakers.

If they are the same spoke length as the dodgy rear spokes, I would. If a different length, how lucky do you feel?

My partner has a Hunt Supadura dynamo wheelset that is on its third warrantee rear rim (cracks). The first two rims were built by them.

Most of our bikes have dynohubs and you could build them with deep rims but check spoke count. Most dynos have lots. Maybe cross one or two. Radial spoking theoretically isn’t a good choice.

Bin all the spokes. They are dodgy metal. It could be a range of things (e.g. stress corrosion cracking, originating from inclusions) but it doesn't really matter. Those spokes can’t be trusted.

The 700x40C Almotions were excellent on my partner’s Tripster.

My expectation is that on the track, it would possibly have been raced on 700C tubs and used 590 wired-ons on the road. Tubs were available in all sorts of sizes for a while e.g. Constrictor

http://www.users.globalnet.co.uk/~pattle/ddgcs/tyres2.htm

Some tubulars are still available in a range of rim sizes e.g. Vittoria Juniores

https://www.vittoria.com/ww/en/tyres/road-tires/juniores

If it was 26” on the road, it was probably 597 or possibly 590, rather than 584. That would have given sufficient mudguard clearance on the road and close clearances on the track with tubs. In 1946, tubs had a fairly big carcass. Think Vittoria Pave tubs.

It is possible that the original road wheels were a smaller diameter e.g. 26” while the track wheels were 700C tubs.

A small difference but most folk would not be able to tell the difference. A change of tyre should make a similar difference.

Brompton used an oversized tubular steel stay to mount a bottle dynamo. I don’t know of anybody else regularly using a stay to mount a dynamo.

Offset brake pads might be an appropriate solution.

Just a random result from a search:
https://bdopcycling.com/product/bdop-offset-brake-pad-holders-pair-black/

Looks like a crack to me. Stop-drilling the ends is sensible (if done well) but make sure you actually hit the ends of the crack.

The vast majority of bottle dynamos are cheap and nasty and won’t hold up in intensive service. The exceptions are expensive and fairly rare.

Are you aiming to run the bottle dynamo on the tyre or the rim? Slipping in wet weather can be an issue.

Most front mudguards are too flexible to support a front light without fracturing from fatigue.

Take account of those issues and you will have a reliable system.

Yes

Are the wheels in the same plane when in the bike, tilted to each other or are they parallel (bike crabbing)? When you walk the bike in a straight line through a puddle, does it create one wheel track or two?

I broke tib/ fib on one leg and femur on the other when a car drove over both legs. Nails were put down both the tib and femur and are still there. I spent six weeks in hospital and six months in a lower leg cast because of slow bone regrowth.

I rode a 200km brevet a year after the crash and have finished 6 x PBP and lots of other long brevets since then. The only significant issues have come from nerve damage caused by the crash. The bone issues have been pretty trivial, other than requiring readjusting cleat angle and saddle height.

Don’t be surprised if there is a small leg length difference now. That is fairly easy to compensate for, if you are aware of the possibility.

Yup, Syncro (2, maybe). Indexed but not a great system.

Spa Cycles saddles are made by Gyes in Taiwan. Gyes make most of the private label leather saddles with detail differences between brands.

The Year Mileage Record is >350km/day but on pan-flat roads.