For those of you who use or have used sandpaper to sharpen 3-blade heads, do you push the head into the sandpaper like Charlie Lamb does with a file in his Woodsman sharpening video, or do you use a sideways motion when sharpening?

Hey Chris : Good to see ya , how ya been :0)Drew

Pull it backwards like the file method.

search "scary sharp".
Here it is;

 http://www.shavings.net/SCARY.HTM