Any question answered...

That would be amazing, thanks.

So in one hand I have a broken rear disc brake in the other a functioning front disc brake.
If I use a smaller rotor can I get this brake to work on the back?
I've got lots of various mounts too...

Would this be the culprit?
It fits the braze on on an old Raleigh Twenty I have and it's definitely not metric. Yours if you want it. Free gratis.

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Last summer we had 2 bikes in cardboard boxes and 2 people plus driver in a Galaxy. The left and middle seats had to be folded down and the bike boxes had to go diagonally right up to the front seats and over the rear passenger. I don't know our cardboard boxes compare to yours so there might be a possibility that they'll fit

If I use a smaller rotor can I get this brake to work on the back?

You'd probably need a custom adapter. All the dimensioned drawings are available online, so draw a front mount over a rear mount and try to get the holes to line up. I could do it myself, but I have youtube videos to watch :) Let us know whether they are IS or PM, and what native rotor sizes the caliper and frame are designed for, that would be the bare minimum required to determine whether it's even slightly possible that a transplant won't be rejected.

it may be hard to find the right thread

It's likely to be 5/16"×26TPI BSC. If you can fine an old front axle of that size with a lock nut on it, you'd just need a bit of suitable tube with a clearance hole for 5/16" but not so large that it misses the face of the boss completely. You can buy studding and nuts in that size if you don't want to carve up an old hub.

The other direction is to use the Constable's bolt and make a bucket with a hole in it to hide the bolt head, if your modern lights are aimed at 31.8mm bars there should be enough room to get a socket into the counterbore to tighten it.

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Choice visualisation. Curious as to what you used to create it.

what you used to create it

Fusion360

As per @mdcc_tester 's reply I used a hard plastic bottle top and the neck it screwed onto to produce said bucket and drilled a hole to mount it with the bolt and a suitable washer. It was a bit of a bodge until I found something suitable or got someone to turn one out of aluminium. Neither happened but the bodge worked well enough.

A dowel with a hole drilled through the centre would work.

Ta.

Could be worth a wander round a stupormarket to see what structural packaging can be moolished into doing the job.
There's plenty out there once you've freed your imagination....

Yes, I'm wondering about one of those film canisters. The ones with very solid lids. Mount the bolt in the cap. Fill the canister with sand for ballast. Paint.

Mmmmm, bodgy.

@constable_savage, if I could relieve you of that bolt (fnar), I'd appreciate it. Where is good for a handover? I'm south east or central.

Thanks all.

Film canister city here...
They go from ~ 31.9Ø OD to 31.6Ø OD to allow for the draft to get them off the injection moulding tool. You could fill them with P38, Araldite, Milliput..... the list is endless.
I don't think the drop in Ø will be significant for your purposes.
Second thoughts - tightly packed sand is probably a better (and reversible) bet.

Edit - You'll most likely struggle with the 'paint' bit. They're most likely fashioned from polypropylene or something similar. Which not much will adhere to.
Insulting tape wrap?

PM me with an address and I'll post it as I'm not London based though if you are anywhere near Wembley, Harrow or Sunbury I am about almost every day.

Don't people still just bolt on a socket?

Very tidy solution.

Oooooh. Interesting.

All this stuff is past best before (oldest is sept 16 for the stinger stuff). Will it kill me/give me the shits?

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No.

https://www.bricklanebikes.co.uk/paul-components-gino-light-mount?gclid=EAIaIQobChMIpoSfno-U1wIV7DLTCh1tNQV1EAQYCiABEgJJA_D_BwE

https://www.sjscycles.co.uk/lighting-spares/black-origin8-eyelet-stub-light-mount/

Is there an IT help thread?
How do I amend this Regexp
". *. csv"
from select all csvs to select all csvs containing 'xyz' in their name

Dot star backslash dot csv. Backslash isn't showing.

.*xyz.*\.csv

Backslash isn't showing.

Gotta escape it, with another backslash.

Would need drilling out to fit the 5/16" bolt, which would leave a very thin wall on the spigot. As usual, there's another way to skin the cat, by drilling and tapping the 5/16" bolt to create an M5 attachment point in the original boss, but that's not really any easier than just making the part I drew.