The project requires a 5" round mirror. I use two 1/2' brass screws for the pivots. Make sure you drill the countersunk holes for the pivoting screws before you cut the leafs pattern. Counter sink the screw hole deep enough so about 1/8" of the screw sticks out the hole.
Cut the pivot tabs on the outer frame long and sand to snugly fit the mirror frame. Make sure that when you tighten the brass screws the mirror will pivot and stay in position. As you tighten the screws the outer frame will put pressure on the mirror to keep it tight.