Removing torsion bar

As you assume I had remove the clip and the bolt is unscrwe all the way. When you write "...then take a drift pin(short bolt) and drive the torsion bar out gently, Backwards...", I don't understand how you do that, and i'm also not sure of you would use as the short bolt.
What size of bolt ( just as a reference in size)?
And how or where to install it to drive the torsion bar out?

Thanks for your help.