After Friday's massive thunderstorm, the monument's "crown" carrying the lightning conductor for Tomb's safety, and an "auspicious symbol" were dislodged leaving vulnerable to lightning strikes.
"The damage of the finial is a matter of worry as it carried among other items, a lightning conductor and since there are forecast of more storms, our topmost priority is to save the monument from any lightning strikes.
"And, therefore by tomorrow we will try to install a makeshift lightning conductor on the top of it," Vasant Swarankar, Superintending Archaeologist, ASI Delhi Circle told PTI today.
"Apart from physical safety, it provided an aesthetic beauty to the monument and represented it's auspicious significance," Swarankar said.
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The ASI, he said, was working to rebuild the finial, but specified no timeline.
"The finial which had a wooden shaft made of Sal has been lost. And, so we are trying to source seasoned wood. The other parts included nine copper utensils with a brass finish over it. Among the nine, two-three parts are damaged.
"Our Science Branch is working on it and so while a few parts will be completely changed, few will be retained and a whole composite structure will be made but we do not yet know of the timeline," he said.
The ASI Delhi chief said, he was "shocked" when he received information about the finial being knocked off as "something of this nature has not happened in the over 150 years of history of ASI".
"We will also try to see if there was any lacuna on ASI's part," he said.