Fit any spacers between the two nuts, then tighten them against each other: it might take a couple of goes to get the preload on the bearings right.
You have cone spanners, right?
Yep, cone spanners I've got.
The main problem is that the two locknuts are 5mm and 4mm, and I only need 7mm of total material between bearing and dropout on the right-hand side, meaning I'm having to be creative.
Any two nuts will do, they don't need to be "hub specific".
I've got spares if you get stuck.
@fizzy.bleach started
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Fit any spacers between the two nuts, then tighten them against each other: it might take a couple of goes to get the preload on the bearings right.
You have cone spanners, right?