The central dome, the gumbad of the Harmandir Sahib was damaged when the Akal Takht was stormed during Operation Bluestar. According to Baba Mohinder Singh, who heads the Jatha (which was founded in Kenya by Baba Puran Singhji Kerichowale in the 1930s) and is directing the operations from his headquarters in Birmingham: "Some of the sheets were repaired and hurriedly put back again. And the gold was cleaned with weak acid which has damaged it. The Jatha has been assigned the task of refurbishing exteriors and interiors of the Harmandir Sahib, the Darshani Dwara and the causeway. "We are using local technology everywhere but with inputs also of the latest technology." The golden kar seva has come to mean a structural rebuilding beneath the superficial layering. "Old timber supports within the central dome were rotting and near collapse," says Baba Mohinder Singh, "there were all sorts of reptiles, insects and infestations that were eating into the structure from within." Also, over the years, the gold plating on the temple, which gave it its name, has worn away, leaving large patches of the black and green copper showing through.