How do I replace the headphone jack?

How do I replace the headphone jack?
I have a set of Sony MDR7506 Professional Studio Headphones with a bent mini plug. I've managed to unscrew the jacket around the plug to expose a red, green, and copper wire. The red wire and green wires are soldered to a short green board extending out of the bottom of the jack assembly. The copper wire appears to be soldered to the metal clamp that connects the headphone jack assembly to the cable.

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