Step 1: Take the canvas off the frame and mount the plywood
Once the canvas is off, the frame is exposed. I wanted the picture to sit a good distance off from the wall. To accomplish this I cut down a sheet of 3/4' plywood to brad to the top of the frame. This not only gave me the height I wanted but also supply a realativly smooth surface to adhere my picture to. To mount the plywood to the board I used a pneumatic brad gun and put several brads along the parimeter of the frame as well as down the middle.