Have to spin the axles at about 10000 rpm to see if they are straight. We were allowed to select as many axles as we wanted so we did reject a few as out of line.
Then you need to polish the axles. Abrasive powder for final stone polishing put in a rag and then spin the axles again in the polish.
Then its time to apply the graphite.
Hey..... my day was 30 years ago. I wrote it up pretty well for one so long removed.
You are benefiting from us pioneers who established the methods decades ago. :)
But....as always, Free Republic gets to the nitty gritty by collectively giving the lesson.