These come in and out easy - couple screws on top and the nut on the bottom. Even easier if you have the whole assembly out of the door. Saves your arm skin
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Sounds like you are referring to the frame they go in though. I haven't removed the "flag" from the "pole" (best description I can think of) but I believe it's riveted on so could be removed/replaced if one really wanted to.
Same goes for the top pivot point on the actual glass frame (what is in the ebay listing). I removed mine to powdercoat them and bought some special shouldered rivets to reinstall.
Scott
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Camano' 1986 F250 Supercab XLT Lariat 460/C6
'Chanute' 1980 F350 C&C 400/NP 435 - Gin Pole
But there ain't nothin' wrong with the radio