This is my personal way of handling this subject. I have a note that I keep to remind me where to put some code.
The "redo" code must be added to "toolbars.cfg" in the Klassic skin.
The "redo.bmp" file must be added to the Klassic skin.
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I add a section between history and print. Then I add an icon to the skin. I have the icon on my website. http://www.perigee.net/~jmd8421r/redo.bmp