What prompted me to do this is that I have wondered how they work on the inside. Taking it apart is the easy bit but reassembling it is the hard part.
The first step is to undo the two screws at the back Be careful as there are nuts that are not secured so they will fall out and you will porbably loose them. After removing the screws there will be some spare tools for different types of IDC connections. Near the tip of the tool there is a small screw. When you remove the screw and take the cover off there is a huge spring so be careful that it doesn't fly across the room and will never be seen again. Once the shell has been removed you will be left with just the tip. The tip is spring is loaded, this forced the tip forward so energy is stored in it when you punch down with the tool. To reassemble the tool you need to put the tip back into the body with the spring. The hardest part is putting the tip back in to the shell without it flying out. When the tip is secure in the lower half of te shell quickly put the top half on otherwise it will fly apart. Put the nut in the recessed part of the shell then fasten it with the screw it came with. Make sure that little button in the centre of the tool is placeed in the shell before securing it closed. Place the two spare tools back in their spots and the secure them with the screw and nut.