Well, this kid named Danny that is in one of my honors classes has like thousands of these generic transparent pens that he transforms into blow dart guns. I came up with this while sitting in Honors Physical Science. Not really amazing, kind of silly, (really silly), but i guess if your this crunched for space it will help :)

Step 1: Materials

Okay first off, you will need a nice sharp knife, or a hacksaw, or some pliers ( Whatever you prefer!) And a regular generic pen.

Step 2: Step 1-Remove Writing End of Pen

Okay first, remove the "writing" end of the pen. Once that is complete we can move on to step 2!

Step 3: Cut the Ink Holder/pen Tubing.

Okay, grab your knife/sharp object, what I did was start sawing, and once I got further into the pen tubing I pushed down and it went right through it. I came out with what you can see in picture 2, (Cut Tubing..)

Step 4: Cut Ink

In some cases this could get messy, so proceed to finish over a paper towel or rag. First, measure the tubing to the ink so you know where exactly to cut (First Picture). And the of course cut the ink. I left my fingers where I measured so I could cut it right outside of them and make the best fit.