I read this post a few years ago and finally had the nerve to try it today -- IT WORKED!! I took apart the inside starting from the rear door of my RX300 and from the spare tire well. I did find as was suggested that a piece of the plastic tie (sp?) was left in the motor. It was so simple to take apart the motor housing, remove the broken piece, reattach everything and reinstall the motor on the car. I fed the new antenna in as instructed and viola' !! I have a working radio!! Thank you so much! All I needed as a thin phillips head screwdriver, a small flat head to pull off those plastic screws and my 5 year old for an assistant!