If the replacement dock connector assembly doesn't have the wire mesh pad on the flex circuit (close to the connector labeled "4"), carefully lift it off with a knife or other thin tool, taking care to keep as much adhesive as possible with the mesh pad. Then transfer it to the same spot on the new part.
If the replacement dock connector assembly doesn't have the foam pad over the connector (labeled "4" on the original part), carefully transfer it to the new assembly, lifting as much of the adhesive off with the foam pad as possible.
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Here's a preview of what the graph will look like:
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