Patent ID: 7191538

Claim:
A method of cutting an opening in a lath and plaster ceiling or wall panel for an electrical box having a configuration with a predetermined peripheral outline, the method comprising the steps of: providing a drilling templet having a planar body member extending beyond the peripheral outline, a central opening extending through the body member within the outline, a saw blade opening extending through the body member and being aligned with the peripheral outline, and a failure point opening extending through the body member and being aligned with the peripheral outline at a point spaced from the saw blade opening; positioning the drilling templet on the panel; drilling through the panel at positions of the central opening, saw blade opening, and failure point opening; providing a sawing templet having a planar body member extending beyond the peripheral outline, a central fastener opening extending through the body member, and a saw blade guide slot extending through the body member and being aligned with and extending around the entire peripheral outline except for points of the outline immediately adjacent to the failure point opening; inserting a fastener through the central fastener opening in the sawing templet and attaching an expandable toggle nut to the fastener; inserting the toggle nut into an opening in the panel formed by drilling through the panel at the position of the central opening; tightening the fastener to attach the sawing templet to the panel with the sawing templet on one side of the panel and the toggle nut on another side of the panel; sawing through the panel along the saw blade guide slot; and removing the sawing templet along with a cut portion of the panel.