Reattach the harp back to the harp base. Insert a light bulb and plug er' in. You could add a shade, but why would you, that socket looks great.
Step 2: Insert the Threaded Nipple
The wooden lamp base should have a through hole drilled through it (11/32"). Use a custom built hand tap to thread the wooden lamp base. Screw the threaded nipple into the base. Leave about 1/2 inch showing.