Be sure to bevel the edges, or it will be hard to,get those yardsticks to slide together
Yup. Easy and cheap If you have a circular or table saw.Yeah you're probably right. It is pretty easy to just rip a board down to make a cleat myself.
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Set saw for beveled cut. Cut board/plywood strip lengthwise to create two identical beveled strips. Attach 1 piece to cabinet and 1 piece to wall and voila. One cut on one board.