You buy the replacement mast from the dealer, remove the threaded on ring at the base of the antenna then lift the bezel under it off. Turn the radio on now. This will cause it to push up the remaining piece. Remove it. Insert the plastic spline and have someone shut the radio off. This will energize the motor down and it will pull the spine annd mast into the antenna housing. Install the bezel and ring now and you are finished.
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