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I did this and it worked okay.
I did have to re-do one dropout on the fork as it just had that slight cross thread feel. I hadn't used the biggest diameter tube that would fit in the axle recess shoulder (I don't know what to call that little lip that the hub sits on while you put the axle in). I did again with a bigger tube and all good. I reckon use the biggest tube you can fit in there for the most rigidity/best chance of square.
Did I see someone had bodged a 12mm dummy axle on here somewhere?
I need to mount what is left of a crashed Cotic BFE in my frame jig and don’t fancy paying for a 142x12 dummy axle as I’m unlikely to use it again any time soon. The dropouts and stays are all in one piece so I don’t need to do any brazing around it, it’d just be to hold things in alignment.