In one implementation, a method includes detecting, using a processor, user input through a camera lens. A second requirement of IP address allocation for the instance is determined according to the first requirement. One or more matched map objects are identified in the database such that the respective descriptors of the matched map objects each match at least one of the query terms. The head is locked by means of exerting pressure with the rod onto the locking ring resulting in compression of the second portion of the receiving part and wherein the locking ring is mounted to the receiving part from the free end of the second portion.