The eastern abutment has been shored up by the addition of a concrete footing. Many stopes are shored with wooden 2x4s or 4x4s. It was excavated and shored up between 1904 and 1908. "Ober Ost" desperately shored up weak points with defenders stripped from less threatened positions. Walker went down and shored up the walls by putting concrete underneath them. This position alienated the lesser nobles, but shored up his position with the burghers. Diving in 20 feet of water and in appalling conditions, Walker shored up the foundations. The structure's islet was shored up underneath, and has a small pier for boats. By 1850 the gallery was unsafe and shored up with pillars. The Columbus monument was shored up during construction, and obstructions to traffic were minimized. The National Park Service has since shored up the aqueduct with steel beams. The front wall is leaning out and currently shored up. Some of the worst fixtures were temporarily shored up with plastic ties. The school was closed for one year, shored up and reopened. Politically Kammu shored up his rule by changing the syllabus of the university.