Good morning. I'd like to pick the brains of you woodworkers. Ok, my girfriends boss wants me to make 75 certificate frames for them, shadow box style. I'm using 3/4" x 2" oak. She wants them to be reusable every year for new certificates. My question is this, what would be a nice looking and simple way to make it reusable? I'm making the back detachable, but do not know how or what to do for them to be able to take the crtificate out and put another in. Ant ideas would be greatly appreciated! The frame in the pic is maple.