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Start with the legs on the back of the jig. The legs have stop blocks that hold the easel up at different angles (Image 1). Decide what angles the jig should go to, then drill stop blocks in both legs that correspond to those angles (Image 2). The stop blocks need to be in the same location on each leg. Use glue to reinforce the pieces.
Tip: Just remember to go slowly when drilling the holes so that you don't put too much side-loading on the bit.
Attach hinges to the easel part of the jig. Place the hinges as far apart from each other as possible.
Attach the legs to the hinges. The stop blocks should face down, toward the back of the easel. Make sure to drill pilot holes since you're drilling into end grain.