Kilbourn had to deal with other problems. On the standard Sherman tank, there was a single hatch in the turret through which the commander, gunner and loader entered and left the tank. However, the 17-pounder's larger breech and recoil system made it significantly more difficult for the loader to exit quickly if the tank was hit; a new hatch was cut into the top of the turret over the gunner's position to resolve this. The final major change was the elimination of the hull gunner in favour of space for more 17-pounder ammunition, which was significantly longer than the original 75 mm.