Abstract: A hinged device (100) comprises a first body portion (105) having a first end (115), wherein the first end (115) is substantially cylindrical and curved about a first axis, and wherein the first end (115) has a first plurality of cogs formed thereon substantially parallel to the first axis. The hinged device (100) further comprises a second body portion (110) having a second end (120), wherein the second end (120) is substantially cylindrical and curved about a second axis, and wherein the second end (120) has a second plurality of cogs formed thereon substantially parallel to the second axis. Securing means (125) movably secures the first body portion (105) to the second body portion (110) at the first end (115) and the second end (120), respectively, such that the first plurality of cogs meshes with the second plurality of cogs when the first body portion (105) is secured to the second body portion (110).