Iida yagura, shown in the photo below, is that five-story turret resting precariously on a single column of cornerstones which has come to symbolize the resilience of Kumamoto following the quakes. The entire structure weighs 35 tons, with that single column bearing the weight of 17 tons. This is clearly untenable, and concerns over continued aftershocks and weather-related effects have added urgency to stabilize the turret.
The Kumanichi reports that engineers have devised a plan to stabilize the structure to allow rebuilding of the walls. This will be done by wrapping the entire turret in a steel frame to allow three cantilever beams to be inserted into the foundation of the turret, relieving the weight from the stone walls. Work began on June 10, is expected to finish in July, and will cost about 8 million yen. Upon completion of this work to prevent total collapse, methods for full-scale restoration will be considered.
The video at the link shows construction of the foundation for the frame as well as tumbled rocks which have been carefully numbered to allow their proper replacement.