My new wheel spindle doesn't fit into the recess in the forks by a tiny margin (it would probably go with a light tap with a mallet but this would damage the threads). The threads on the spindle are 0.5mm (0.02") wider than the recess.
I see three possible solutions (short of a new spindle):
1) Burr out the recess in the forks slightly.
2) Machine a slight flat on the spindle then run a die along it to clean up the threads.
3) Get my mate to turn the top 0.25mm off the threads on his lathe.
I'm inclined to burr out the forks but am open to oppinions.