Abstract: Apparatus for aligning misaligned vertebrae including a partible screw which can be threadedly coupled to misaligned vertebrae and decoupled from the vertebrae after being aligned. The screw, which is rotatable about an axis, includes axially shiftable screw halves having complementally formed partial screw thread sections which can be aligned in any one of a plurality of axially spaced apart positions to define a helical screw thread. Apparatus is provided for detachably holding the screw halves together in any one of a plurality of axially spaced apart positions with the partial screw threads on each of the halves in alignment including an alignment collar and a locking collar which can be detachably threadedly received on, and locked to, the screw thread sections in locking positions when the screw is being threadedly coupled to and uncoupled from the vertebrae.

Abstract: A coil of hollow tubing is bonded onto itself to retain the integrity of the coil by depositing a bead or stream of adhesive onto the exterior of the tubing along the extent thereof. By coiling the tubing the adhesive comes into contact with itself to removably bond the coil together. In use, any desired section of the coil is "peeled" from the remainder of the coil. The present invention is particularly advantageous in use with drain tile.