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Glue a small 1/4x1/4 square of sandpaper to the tip of a pencil easer.
For small sanding "sticks" you can also spray the back of a piece of sandpaper with adheasive and lay out popsicle sticks, wood coffee stirrers, etc. When the glue dries just cut off a stick and sand, if your anal you can even write the grit on the stick.
Great info, Im gonna have to try some gliders now.