When you can't find a matching profile at a lumberyard or home center, the easiest way to get a copy of your existing crown is to send a cutoff to a wood millwork shop or a maker of foam or plaster moldings, such as Fypon or Hyde Park. But if a scrap isn't handy and your crown doesn't have details like dentils and leaves, make a template using a profile gauge (left). Press the comb-like device against the crown, then trace the shape onto cardboard, noting which edge is the crown's face.
Shown: Stainless-steel tracing profile gauge, about $23.50; Lee Valley Tools
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