Abstract: A manually manipulable actuator mechanism includes a body and a manually manipulable element. The body has at least one wall element having a length extending along a first axis and a height extending along a second axis orthogonal to the first axis. The manually manipulable element has a button portion adapted for human digital manipulation and at least one wing portion extending outwardly from the button portion. The manually manipulable element is movable along the first axis between a first position in which an operative element is in a non-actuated condition and a second position in which the operative element is in an actuated condition. The wall element, which has a first height at the first position and a different second height at the second position, cooperates with the wing portion to constrain movement of the manually manipulable element at least along a third axis orthogonal to the first and second axes while the manually manipulable element is moved between the first and second positions.