Abstract: A method and device are provided for disposing a part of a generally cylindrical work piece in a path of a laser beam such that a first portion of the beam passes by one side of the work piece, positioning a laser beam receiving processor in a manner to receive the first portion of the laser beam in order to enable a determination a size of the part, disposing another part of the generally cylindrical work piece in a generally V-shaped seat such that the work piece contacts two sides of the V-shaped seat, and applying sufficient force on the second part in a manner to cause slidable rotation of the work piece in the V-shaped seat while maintaining contact with the two sides.