An improved loader is described. The loader includes a frame having an upper surface, a pair of horns adjustably connected to the upper surface, each horn comprising an upper shoulder, a lower shoulder, and an air duct between the upper shoulder and the lower shoulder, a pair of air hoses connecting each air duet to a controller, the controller being connected to a pressurized air supply, and an alignment mechanism mounted, the alignment mechanism including an axle mounted to the frame, a first arm connected to a first panel, the first arm rotatably connected to the axle, a second arm connected to a second panel, the second arm rotatably connected to the axle, a gear mechanism connected to the axle and to the first arm and the second arm, the gear mechanism configured to rotate the second arm in a direction opposite to a direction of rotation of the first arm, and a dual-action cylinder connected to at least one of the first arm and the second arm.