It sounds like you’ll need to drill out the remaining screw. If the head is still present try heating it up with a soldering iron, then try turning it while hot. Apple used a thread seal that softens with heat, otherwise you can get the Loctite solvent [https://www.henkel-adhesives.com/us/en/product/industrial-adhesives/loctite_sf_768.html|Loctite SF768]
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It sounds like you’ll need to drill out the remaining screw. If the head is still present try heating it up with a soldering iron, then try turning it while hot. Apple used a thread seal that softens with heat, otherwise you can get the Loctite solvent [link|https://www.henkel-adhesives.com/us/en/product/industrial-adhesives/loctite_sf_768.html|Loctite SF768]
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Here’s the screws [https://www.thebookyard.com/product.php?cPath=39_1263_1265_695&products_id=20880|Antenna Screws]
It sounds like you’ll need to drill out the remaining screw. If the head is still present try heating it up with a soldering iron, then try turning it while hot. Apple used a thread seal that softens with heat, otherwise you can get the Loctite solvent [https://www.henkel-adhesives.com/us/en/product/industrial-adhesives/loctite_sf_768.html|Loctite SF768]