Step 3: The "Helmet"
First off, grab your dremel tool or something that can drill a small hole through plastic and drill a hole big enough to put your L.E.D. in.
Once in, drill a hole in the side near the sealed end of the cap, this is where the positive wire will go through to connect to the spring you will later put inside the cap. I fed the wire in and out the open end of the cap, then soldered on my spring and fed back in. I also hot glued the L.E.D. and spring in place once I had the spring in position.
Done and done, back to the chair!