Build your forms 3.5 inches tall. If you're using molding for detail set that at the 3" mark. If not just notch a half inch out of one end of a piece of 2x4. Fill with cement to the top of molding and vibrate. Add a couple shovels to the middle. Put one end of a piece of wood on the molding and the other end on top of the form. Screed. Repeat on each side several times, adding or removing cement as needed.
Maybe I'll post about this with pictures when I finally get around to it this spring/summer.
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