Cut an outlet box in plaster. Use a flat head screwdriver, tapping lightly to break the surface coat. Once you finish tap-cutting with the screwdriver, carefully clear away the debris all the way to the lathe. Using a keyhole saw, cut on one side of the lathe, leaving about 3/8 at the bottom. This is so the lathe will be easy to remove without damage to the plaster. Then, cut the other side completely. Finally, cut the 3/8 inches on the other side.

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