To hang a plaque or frame truly flat against the wall, recess the saw-tooth hanger.

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To hang a plaque or frame truly flat against the wall, recess the saw-tooth hanger as shown above left. On plaques or wide picture frames, you can use a Forstner bit; on narrow picture frames, rout the recess with a straight bit as shown above right.
—Erv Roberts, Des Moines, Iowa