When some keys on your Dell Inspiron E1705 keyboards(http://
Firstly: Orient the hinge
The plastic hinge mechanism must be oriented as shown for it to fit onto the metal keyboard hooks without breaking. Notice the hole on the left side of the hinge is narrower than the hole on the right side. And then hook the right inner edge of the hinge over the metal hook on the base of the keyboard.
Secondly: Secure the hinge into place
"Stretch" the hinge over the right metal hook on the keyboard base. The hinge can actually slide apart slightly, which allows it to fit over both metal tabs on the keyboard base. Once it is sitting in place as shown, it will be easier to put the key on if you "compact" the hinge back together. That is, push the right-side underneath portion of the hinge towards the left. The hinge should now fit snugly in it's place.
Thirdly: Place the rubber spring piece
If your keyboard is missing the rubber spring piece, place it in the center, with the large end down. It will be held in place by the surrounding hinge bracket in a moment.
Fourthly: Insert the hinge mechanism
Insert the bottom two white plastic tabs on the hinge mechanism into the plastic base piece, one side at a time. In the image below, the left side is being tucked into place first.
Fifthly: Secure the hinge mechanism
Push down and towards the top of the hinge to tuck the remaining top two white plastic tabs into place. A bit of even pressure should be enough to click the two tabs into place on the plastic base piece. The hinge assembly is complete and should now look like what is pictured. You can now check that the hinge works properly by pressing down on it. If it springs back easily, it is ready for the key to be attached. If it doesn't feel right, you may need to remove the hinge one tab at a time and try repositioning the rubber spring piece.
Sixthly: Press the key into place
Align the key on top of its place on the keyboard, and press down evenly. All four corners of the key should click into place.
However, please Note that the same laptop model can have several different types of hinge mechanisms under the key. Some colors in the pictures may differ for your model. That is fine, what matters most is the shape of the hinge piece.
Photo:
http://www.prlog.org/




