To replace the power Antenna mast gets the radio on and stick the thinnest rod section (100 rod) about 26mm (1 in) above the other sections immediately disconnect the power on the battery or disconnect the battery or disconnect the power lead from the radio or disconnect the power lead from the Antenna. Next, unscrew the last using a wrench (or other proper size pliers) on the flat surface while ensuring that the 100 rod section is not turned from its position using padded pliers to prevent damage. The 100 rod is not movable but should not be bent as well. After that pull up and slide the sections (3,4) over the 100 rod with the help of fingers or long nose pliers and then remove them. During the installation, grease with the provided grease contractor and drive the assembly tool (brass tube) over the contractor to press the contractor fingers, which forms part of the change of parts package. Slide the mast assemblies (3, 4) over the 100 rod section and down into the mast stationary tube past the contractor fingers then take off assembly tool. Install the bottom mast into the stationary tube above the top of other tubes, with the threaded top of the 100 rod section; next, install the insulator stop and the last. Reconnect the power source and turn the Antenna mast.