Provided herein are methods and compositions relating to the attachment of water soluble polymers to proteins. The handle shaft includes first and second handle shaft members axially spaced apart from each other, and the detection section is provided between the first and second handle shaft members. In an embodiment, the underwater cable burial mechanism may be a component of an array burial vehicle, the array burial vehicle further including a pump to provide water to the nozzle, cable pack to hold a cable array, at least one ski configured to ride along the sea floor, and at least one thruster configured to propel the array burial vehicle along the sea floor. Given employment of scanner drums having different diameters, the size of the illumination spot is corrected by a modification of the imaging scale of the light spot.