During her repairs after being torpedoed in October 1941, "Nelson" had her torpedo tubes and UP rocket launchers removed and an octuple 2-pounder "pom-pom" mount was installed on the roof of 'B' turret. A pair of Oerlikon AA guns were installed on the roof of 'C' turret and eleven more were mounted in various places on the superstructure; all of which were in single mounts. The existing "pom-pom" directors were replaced by Mk III models and three additional directors were fitted. Each of these directors was equipped with a Type 282 gunnery radar. The HACS directors received Type 285 gunnery radars while the forward main-armament director was fitted with a Type 284 gunnery radar. The ship was also equipped with a Type 273 surface-search radar and four Type 283 radars for using the 16- and 6-inch guns in barrage (anti-aircraft) fire. Another Oerlikon gun was added to the roof of 'C' turret during a refit in September–October 1942. The 0.5-inch Vickers machine guns were removed and 26 single Oerlikon guns were added in May–June 1943; five of which were on the roof of 'C' turret and the other were mounted on the deck and the superstructure.