A pen retention bracket for releasably securing a pen tether retracting reel therein is disclosed. The pen retention bracket includes four surfaces that define a rectangular cavity having four sides and a top opening and a bottom opening. A first protrusion and a second protrusion are disposed upon a first surface and extend from the first surface toward a second surface, a distance between the first protrusion and the second protrusion greater than a height of the pen tether retracting reel. The first surface is responsive to an application of force to the pen tether retracting reel to elastically deform and increase a depth between the second surface and at least one of the first protrusion and the second , thereby releasing the pen tether retracting reel via either of the top opening and the bottom opening.