Apart from routine maintenance, the instrument remained untouched until 1952, when Henry Willis & Sons undertook a major rebuild, during which the wind pressures were increased. The balanced Swell pedal and the hitch-down Solo pedal were replaced by Willis's Infinite Speed and Gradation pedals. The Choir organ – which had been housed in front of the Swell – was relocated to the north side, and a new console was installed adjacent to it (the original console was on the south side). The Choir organ's Flauto Traverso was replaced by a Nazard, and a Tierce was provided on a new slider. A number of new couplers were also provided and the Violon unit (32'-16'-8') was extended by 12 pipes to create a Viola 4'.