Catherine class in RN) had a similar arrangement. Royal Navy alterations The first port of call in the United Kingdom for most of the Captain-class vessels was Pollock Dock, Belfast where the ships were modified in order to match Admiralty requirements. In all there were 109 items in the alterations and additions list for the Evarts and 94 for the Buckleys. One major design difference between the Royal Navy Buckley-class frigates and the US Navy Buckley-class destroyer escorts was that the Royal Navy frigates did not mount torpedo tubes. (The Evarts class was not designed to carry torpedoes.) The resulting reduction in top weight combined with the previous reduction in the gun battery resulted in excessive stability, causing sharp and violent rolling behaviour in the relatively short North Atlantic swells. Several solutions were discussed including reshipping the torpedo tubes and replacing the American 3"/50 caliber guns with heavier British 4.5 inch but all proved impractical due to production bottlenecks and wartime congestion in British shipyards. The problem was ultimately addressed by increasing the number of depth charges stowed on the upper deck and fitting larger bilge keels, which tamed the roll to manageable levels. Further alterations were: Sea-keeping equipment A crow's nest was affixed to the mainmast. A standard Royal Navy whaler was fitted on the port side of the funnel in addition to the US-issue ship's boat on the starboard side; additional Carley lifesaving rafts were also fitted: big ones on sloping launch skids aft of the funnel and small ones aft of the searchlights. Wind deflectors were fitted on the leading edge of the bridge area and a canvas-covered shelter was installed on the quarterdeck to provide better weather protection for depth charge crews. Oiling fairleads were fitted to the edge of the hull by the anchor winch. The bilge keels were lengthened and made deeper (a process that took a minimum of three weeks). Gunnery More 40 mm Bofors and Oerlikon 20 mm guns were mounted in place of the removed torpedo tubes, and the MK IV elevating column Oerlikon mountings were replaced with the simpler MK VIA mountings; those ships that were to serve as Coastal Forces control frigates hunting E-boats had extra guns fitted. On some ships, either gun shields were fitted to the main armament, or a spray and blast shield was fitted to the B gun. Two-inch rocket flare projectors were fitted to