Phillips screwdriver (standard size), Dollar store foam dart gun (found at dollar tree in indiana), Pen (you need the special shape like the Unison Medium pt. pen shown).
Step 2: Disassembly
Unscrew the screws holding it together. Don't worry if it takes a little pressure to pull apart. All you will need is the black hollow cylinder connected to the green dart shooting barrel. Pull the green barrel and the black cylinder apart. I advise thoroughly washing the grease off the cylinder because you are going to put it partially in your mouth.
Step 3: Putting it together
The little nub at the end is the part that will stick into the end of the pen. Pull the back end off the pen (which isn't too hard if you use the unison pen). The nub should fit right in the open end of the pen. Also take the ink stick out of the pen.
Step 4: Done!
Now you can blow dust out of those tight places. Plus it can be a candle and match douser for all you pyrophia people out there. Please feel free to ask questions. Sorry about bad pic quality. I was using the Nintendo DSi's camera (1 megapixel). Mario 4 life!