I usually work alone, but when I install upper cabinets, I always enlist the help of two shop-made cabinet jacks. They’re steadier than an extra pair of hands. The jacks stand on the lower cabinets. To position and level the upper cabinets, I just turn two bolts in each jack. The jacks are 15″ tall
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Hampton Bay Hampton 30 in. W x 24 in. D x 34.5 in. H Assembled Base Kitchen Cabinet in Natural Hickory with Drawer Glides KB30-NHK - The Home Depot
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Krenov Style Whiskey Dovetail Cabinet Designed in Sketchup