Step 3Attach the hinges
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It get's pretty straight forward from here. Take your 3/8" pieces of scrap and put them on the underside of the drawing surface so that the table lies flat. Line up the table to the drawing surface so you have a 3" overhang. Center the hinges and space them out evenly along the bottom of the drawing surface- I have about 14" between my hinges.
Also, make sure that the smaller part of the hinge is attached to the table, not the drawing surface.
When the hinges are on flip it over and give it a test.