Two Allen screws at the bottom plate
The two allen screws at the bottom plate of the armboard securing the mount of the tonearm. You have to releave both screws to remove the tone arm form the baseplate. Just turn the screws two or three times. That should be enough for removing the complete arm.
https://www.buildandlisten.com/turntables/thorens-td160/rewiring-the-tp16-tonearm/690624ad-477c-48be-b153-149214bca3c4.jpeg/view
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Two Allen screws at the bottom plate
The two allen screws at the bottom plate of the armboard securing the mount of the tonearm. You have to releave both screws to remove the tone arm form the baseplate. Just turn the screws two or three times. That should be enough for removing the complete arm.