re: Business Card Boxes for University Symposium

The "hinge" is a 1/16" dia. pin on each side.   Hole drilled through the side pieces into the bottom area of the back of the top.   You can see the pin head on some of the pictures.   It enters the top piece about 1/8" above the bottom edge.      Kind of tricky not to get to near the edges of the top or to near the bottom of the back vertical of the top.