It all depends how the key is actuated. The alpa / numeric keys have a mechanism that looks like those tray tables you get out when company comes over, where the legs on the side look like an X. The top part of the X snaps into the key cap. Longer keys have different set ups. Then there is a little rubber plunger that pushhes down on the contacts when the key is pressed. If the key cap comes off the plunger can get lost. Actually I have found that there really is no short cuts when it comes to PC's. The best way is to do it correctly, and get the kb replaced.