• Couple of ideas:

    Cut a quadrant out of the spacer so you can drop it in place once the axle is in, before locking. Still going to be a fiddle though.

    How is the hub itself finished? Is there an insert in the end that you could remove, and then get a machine shop/model engineer/tool maker/friend with a lathe to copy but make 1.5 or 2 mm longer?

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