[Karl Wolf]

There is a way to do this by hand, using a very sharp pencil.
The trick is to put the tip of the pencil into the end of the spiral,
in three places- sharpen the pencil for each one. Break off the tip of pencil.
I haven't done this in years, would have to go get a drive from my parts to make this more clear.
Let me know if you're interested.
Karl