Ever need to disassemble/deconstruct/separate the Hemma's components to feed just the wire through a lighting project? Instructions to do so couldn't be found on the Internet, so I tackled the project and am sharing in the hopes that it helps others with their projects!
The point of this Instructable is to demonstrate how to pull apart an IKEA Hemma Cord Set into its separate components. Once this is done, you'll be able to feed the electrical wire of the cord set through much smaller openings/holes than the cord set normally allows.
Step 1: The Tiny Tab That Keeps the Head Together
Inside the socket, there's a small golden metal tab. This tab creates the electrical connection with a light bulb (when one is screwed into the socket). For now, though, this tab is keeping us from being able to unscrew the head of this fixture.
Insert a slender screwdriver between the end of this tab & the side of the socket -- then pry the tab upwards just enough to ensure that the tab is clear of the ribs on the inside of the socket.
Step 2: Unscrew the Socket Head From the Socket
Step 3: Remove the Socket's Inner Components
Remove the electrical connection part of the base (the black plastic part that makes contact with the bulb) by simply pulling it outwards with your fingers.
Then, use a slender screwdriver (or similar instrument) to pry the rest of the components out. The white tabs through which the wire feeds are held in place by pressure against the surrounding socket. They should come out with a combination of prying & pulling. Shouldn't be too difficult.
Step 4: Break the Inner Tabs
In the accompanying photo, you'll see an inner bushing that has tabs on each side (in the upper left quadrant of the photo).
The method that worked for me was using some pliers (wrapped with tape to protect the plastic) to twist the top of the socket until those tabs snapped. Work delicately & slowly here. Too much force will damage the outer plastic.
Once the tabs snap, you'll see that the interior bushing twists freely (shown in the lower-right quadrant of the photo).
After the tabs have snapped, you'll be able to simply unscrew the top cap that is holding the remaining socket components to the wire (lower-left quadrant of the photo).
Step 5: Remove Remaining Parts
Using a small screwdriver, unscrew the posts holding the black & white wires in place (noting that the black wire is connected to the gold post and the white wire is connected to the silver post).
Then, you can slide the remaining plastic pieces off with your fingers.
Step 6: You're Done!
To provide an example of why you might wish to remove all of these components, I've included a photo from a recent test project: feeding the wire of the Hemma Cord Set through an IKEA Ekby Valter wall bracket (http://www.ikea.com/us/en/catalog/products/56696109/).