I used epoxy to glue it in place, be very careful, no glue should enter into the connector, its end is open.

In this image you can also see the right way to pass the speaker wires to the bottom side of the board, they should go between the speaker and the plastic pillar for the screw.

Try to your favorite headphone to see if it works.

I can fit both the TV-OUT and the headphone at the same time, but as expected, as soon as the TV-OUT is connected, the speaker is muted.

ENJOY IT!