A constraint mechanism for receiving an audio plug in an electronic device is provided. The constraint mechanism may include a conductive tube operative to receive the audio plug. In addition, the constraint mechanism may include several features operative to engage corresponding features of the electronic device to prevent the constraint mechanism from moving in any direction (e.g., which could cause damage in the electronic device if the audio jack was forced to move by an impact on the audio plug). For example, the constraint mechanism may include a center wall to prevent yawing, and rear tabs to prevent pitching. As another example, the constraint mechanism may include a side plate operative to be coupled to the electronic device to prevent rolling. In some embodiments, the constraint mechanism may include an asymmetrical tube entrance for ensuring the proper alignment of the constraint mechanism with an electronic device opening. The tube may include a conductive dimple extending through an aperture of the tube, where the aperture is substantially the same size and shape as the conductive dimple.