In 1898 Colonel Montgomery recommended that Gilkicker be modified to take the latest Breech Loading guns in place of the 10-inch and 9-inch RMLs on the lower gun floor. The upper battery was to be completely remodelled to take two of the latest 9.2-inch BL Mark X guns on barbette V mountings with two 6-inch BL Mark VII guns on CPII mountings for closer range support. The 9.2-inch BL was to counter Armoured ships up to a range of 6,000 yards whilst the 6-inch BL was for use against unarmoured ships, ships attempting to block channels by sinking in them and against ships trying to break through booms (blockers and boom smashers). The authority for the alteration was given in 1902. The work was completed in October 1906 at an estimated cost of £16,000 and an actual cost of £19,671. The contractor was William Hill of Gosport. The work included the rebuilding of the magazines, gun emplacements and barrack block. The magazines were altered to accommodate 1000 6-inch B.L. shells and cartridges and 500 9.2-inch BL shells and 1,000 cartridges. As part of this work the whole of the exterior granite wall of the fort was covered with earth and the front ditch filed to protect the shell and cartridge stores. Position finding cells were built into this bank at each end of the fort. each worked in conjunction with a transmitting station exterior to the fort, that for the 6-inch guns at Fort Monckton and that for the 9.2inch guns at No.4 battery of the Stokes Bay Lines.