Not a problem. For now at least, I'm using a single cog on a freehub with spacers in the back, so any old chainline will do.

Anyway, as a direct result of your query about the spindle markings and the subsequent disassembly, I got a good look at the inside of the fixed side threads and discovered that this thing isn't French threaded as I had previously assumed.

As seen in the other thread I started parallel to this one, it's looking like it's English threaded, which obviously will make my life much easier.



Thanks to everyone who kindly offered their help and insights.