I just did mine. First take off the antenna. cover your fender area with a fender guard or use masking tape. Just in case you you slip and fudge it. I dont see this happening though. anyway. Get some needle nose pliers like everyone else said. make sure you got some electrical tape on them so you wont scratch your bezel or screw up your nut. Loosen the nut with the pliers using the three groves on your nut. Then reinstall you antenna. Now unscrew the nut by hand and slip it over the antenna. now take the bezel and slip it over the antenna. Do not worry about the inner piece falling in or to the side. You have your antenna to keep it in place. Now slip the New chrome bezel and nut over the antenna and position it all together and hand screw it in. After you got it in place and hand tight take of the antenna and use your pliers to tighten it up. Be very gentel it does not take alot of pressure to break it loose or tighten it. [^] Now enjoy.
I hope I did not afend anybody by breaking it down like this. I just want to help out those who have no idea on how to do it.