A mechanism comprising a base having a top surface and including a groove extending along the top surface and a frame flexibly coupled to the base. The frame includes a right side attached to a left side. The right side has a substantially “L-shaped” cross-section and includes a knife portion and a creasing portion. The left side includes a substantially “L-shaped” cross-section and is rigidly coupled to the right side such that the frame has a substantially “U-shaped” cross-section that is sized to receive at least a portion of the base. A first spring is positioned proximate the knife portion and is arranged to control a compressive force between the knife portion and the base and a second spring is positioned proximate the creasing portion and is arranged to control a compressive force between the creasing portion and the base.