Sometimes I need two pens of different colors handy for marking drawings. To keep them together, Here is a way to have two pens in one. You simply take two BIC Round Stic pens of your color choice, trim the ink tubes and shove them together.
Step 1: Take Them Apart
First, pull apart the pens to separate the pen part from the barrel. Don't pull apart the ink tube from the tip or you will have a mess.
Step 2: Measure and Mark the End.
On the end is the end cap. The cap is so tight to the barrel, you need to cut it off with a razor or Xacto knife. Measure 3/8 inch from the edge of the barrel.
Step 3: Cut the End
Cut off the end cap by 3/8 inch.
Step 4: Mark the Ink Tubes.
Lay the pen sections side by side as shown to determine were to cut the ink tubes. The tubes need to be short enough when assembled, to have an 1/8' gap between the ends. The ends can't touch together when shoved back in the "Round Stic" barrel or the ink will mix and run out. The ink is thick and capillary action keeps the ink inside. Use a sharpie to mark were to cut.
Step 5: Cut Each Ink Tube
Use a razor or exacto knife to cut the ink tube. Do it on a piece of toilet paper and wipe the blade clean after cutting. Don't use scissors or you will have a mess.
Step 6: Clean the Ends.
Use toilet paper to clean all the ink at the ends. This will prevent the ink from running out. Try to get a bit just below the edge of the cut. Throw away the end you just cut. You will loose some of the ink, but have you ever had a pen long enough to use all the ink? With this new and cool pen, everyone will want it!
Step 7: Clean Ends
This is what the ends should look like after cleaning.
Step 8: Check Before Re-assembly
Check the lengths before re-assembly. Lay the two half's side to side. Now you are ready to shove them together to form one double color pen.
Step 9: The Final Jam
If you have trouble getting the two half's together in the Round Stic barrel, use the other barrel to jam it together.
Step 10: You're Done!
Now you got a double ended pen to amaze and freak out your friends with. The original Idea came from Mark Sherman, Thanks Mark!