In one example, a connector includes: first and second pins protruding from opposite sides of a panel or a frame; first and second receivers on opposite sides of the other of the panel or the frame to receive the first and second pins; a first distance between the receivers shorter than a second distance between the protruding ends of the pins such that the first pin may be inserted into the first receiver and then the second pin inserted into the second receiver but both pins may not be inserted simultaneously into the receivers; and a movable retainer integral to the panel and the frame to retain the pins in the receivers The retainer is movable between a first position to limit axial travel of the pins in the receivers and a second position to not limit axial travel of the pins in the receivers.