Put an iron shelf or choose a thicker tatami board. A hole will be punched in the lid of the box. There are also hydraulic rods, but they are not practical. The first is to release them.
Things are not easy to put away. Secondly, it is not enough to use hydraulic pressure for a period of time, which is easy to break and will hit people. And the cost is high, and tatami liquid is rarely made now.
Pressure bar