How about a wax stick. You can probably find them at just about any hardware store. They're used to fill nail holes in things like natural wood door trim and baseboards. They're available in a variety of wood colors. just rub it on the hole until it's filled then polish with a cloth.
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Jack's Disclaimer: When I say something.... always ask yourself ..... "What the hell does he know?" _
Guys - learn to disable the flash on your digital cameras.