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How to hang sheet metal in your cabinets
Lay a straight edge on the bottom shelf of the cabinet.
Measure the inside surface of the cabinet, by first laying a straight-edge face flat on the bottom shelf of the cabinet with one end of the straight-edge sticking out of the cabinet a few inches.
Slowly close the cabinet door until it is lightly touching the straight-edge.
Mark a pencil mark on the door where it touches the straight-edge. Move the straight-edge over at least a couple of inches and make a second mark.