I've got three sets on my Catalina 36 (solid teak, Plexiglas, and screen), so three times the fun. They also live in the aft berth and slide around. I solved the problem cheaply this year with 10 foot of 1/4 inch shock cord and some plastic J-hooks, all bought on Amazon for about $20. I found a convenient spot on a shelf over the engine, where the shock cord will pull the boards into a corner. I laid out the shock cord in a zig-zag pattern going top to bottom, and screwed in the J-hooks with small SS screws. I ended both sides with a small eye-strap that had laying around the boat. I threaded the shock cord up, and put a very small amount of strain on it to avoid pulling out screws. No need for pictures as your boat will vary. To add or remove boards, I just unhook a corner or two of shock cord. On reflection, I should have used slightly smaller shock cord to make it easier to pull, but this should last for a few years.