I'm a silk screener and have my own shirt shop. A screen fabric is stretched tightly over a wooden frame and glued tight. It's through that screen that you print your design. After a certain number of designs, the screen fabric kind of poops out, loses it's tension and can't be used anymore and my wife noticed that if I cut the screen out of the frame and screw a piece of sheathing on, it would make a nice telescoping outer cover that fits just exactly around a hive body. We have dozens of these old silk screen frames around, and finally have the perfect use for them.