A clamp mechanism includes a clamp configured to receive an associated support structure, a connecting assembly attached to the clamp, and a mount assembly configured to secure an apparatus to the clamp. The connecting assembly includes an engagement member selectively movably into engagement with the associated support structure for securing the associated support structure within the clamp. The mount assembly includes a first mount connected the clamp and a second mount connected to the apparatus and adapted to be rotationally indexed relative to the first mount to secure the apparatus in at least two positions relative to the clamp.