A device comprising: a shutter blade supported by an end plate (110 or 111); a cam driver (130 or 131) having a cam pin positioned to traverse a cam slot in the end plate (110 or 111) of the shutter blade , the cam pin and cam slot configured to lock the shutter blade in a closed position, and configured to open the shutter blade as the cam pin traverses the cam slot ; a frame to mount in a media dispensing portion (620 or 725) of a self-service terminal (600 or 700); and a cam shaft rotatably coupled to the frame and coupled to the cam driver (130 or 131) at an end of the cam shaft , wherein the cam pin is spaced on the cam driver to rotate about the cam shaft; wherein the shutter blade is rotatably attached to the frame at an attachment point on the end plate (110 or 111) that is opposite the shutter blade , wherein the cam slot has a curved shape from a first end to a second end such that the cam pin is operable to lock the shutter blade when positioned proximate the first end , wherein the curved shape of the cam slot has an axis of curvature centered about the cam shaft for a first portion between the first end and the second end , and curves away from the cam shaft for a second portion between the first end and the second end of the cam slot ; wherein the second end of the cam slot is oriented directly above the attachment point when the shutter blade is in the closed position, and the first end of the cam slot is oriented above the attachment point and toward the shutter blade when the shutter blade is in the closed position such that upward force applied to the shutter blade is applied via the cam pin transverse to the cam slot ; and wherein the first and second portion are curved to keep the shutter blade closed as the cam pin rotates downward in the cam slot , and to open the shutter blade as the cam pin continues to rotate beyond the attachment point on the end plate (110 or 111). a shutter blade supported by an end plate (110 or 111); a cam driver (130 or 131) having a cam pin positioned to traverse a cam slot in the end plate (110 or 111) of the shutter blade , the cam pin and cam slot configured to lock the shutter blade in a closed position, and configured to open the shutter blade as the cam pin traverses the cam slot ; a frame to mount in a media dispensing portion (620 or 725) of a self-service terminal (600 or 700); and a cam shaft rotatably coupled to the frame and coupled to the cam driver (130 or 131) at an end of the cam shaft , wherein the cam pin is spaced on the cam driver to rotate about the cam shaft; wherein the shutter blade is rotatably attached to the frame at an attachment point on the end plate (110 or 111) that is opposite the shutter blade , wherein the cam slot has a curved shape from a first end to a second end such that the cam pin is operable to lock the shutter blade when positioned proximate the first end , wherein the curved shape of the cam slot has an axis of curvature centered about the cam shaft for a first portion between the first end and the second end , and curves away from the cam shaft for a second portion between the first end and the second end of the cam slot ; wherein the second end of the cam slot is oriented directly above the attachment point when the shutter blade is in the closed position, and the first end of the cam slot is oriented above the attachment point and toward the shutter blade when the shutter blade is in the closed position such that upward force applied to the shutter blade is applied via the cam pin transverse to the cam slot ; and wherein the first and second portion are curved to keep the shutter blade closed as the cam pin rotates downward in the cam slot , and to open the shutter blade as the cam pin continues to rotate beyond the attachment point on the end plate (110 or 111). <EOS>