1. The square pipes (or angle or square timbers) should be fixed inside perimeter of light box
2. Fix V-spring sets inside a DAYLIGHT panel frame
3. Set the right position of stoppers with V-springs on the DAYLIGHT panel to assemble.
4. Fix stoppers on the side of pipes (or angles and timbers).
5. Insert V-springs into the already fixed stoppers, and then push the DAYLIGHT panel up to interlock.
6. In the case of opening the DAYLIGHT panel, first pull the panel down
7. And secondly release V-spring from the stoppers in one side.
8. And then the DAYLIGHT panel will be opened easily by function of the opposite V-spring as hinges.