Originally Posted by
photogravity
If they're that close, you probably won't have a problem reusing the spokes. That's only 1.5mm per spoke.
I would think you can get away with it. But if you are concerned, screw a nipple onto each spoke end far enough that the spoke sticks out the other end. File end of spoke, and then remove the nipple which will take care of the threads. To answer your query on the CR18, it is 612mm ERD.