For the crowning ball to work correctly, rotate the crowning ball as the same fashion as a child's toy "top" spinning as it is loses velocity. [img width=600 height=246]http://i602.photobucket.com/albums/tt107/cet1921/top.png[/img]

In other words, do not keep the shaft of the crowning ball parallel with the bore. This ensures that the barrel crown edge will be be cut evenly.

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I always use a brass rounded slotted screw. Some people use a steel ball. Both work. With the brass there is no chance of galling. But, brass wears out much faster and one brass screw will last a long time.

taylorwkrs