The wires on Flow Frames can occasionally become loose, causing the frame to become flexible. If you want to tighten the wire, remove the top cap and use a levering tool to remove the wire out of the slot on either side of the top of the Flow Frame. Hold the wire taut, and twist it so that it crosses again in the middle of the frame. You may only need to twist it once, or a few times, depending on how loose the wire is. Then slide the wire back over the top of the frame and into the slots, using the levering tool if needed.