? Removing pillar socket Grace 707

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Hi,
I need to rewire a 707, but can't get the socket out of the pillar (IE the black plastic 'female' connector, which is recessed into the bottom of the chrome pillar/post of the arm)

The slotted grub screw came out fine, but the socket doesn't want to move. Has anyone rewired a 707 and come across this issue?
 
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