When working with Fiber Optic lights you will have to cut the fibers according to your liking.
What you should have before we start is
1. Pocket Cutter
2. Fiber Optic Lights
3. 400 Grit Sanding Film
Step 1: Insert Ends of Fiber Optics Lights Into Holes of Pocket Cutter
Step 2: Cut and Release
Step 3: Sand Down Tip for Optimal Light
San the tip on 400 grit starter, use a pink film to polish it off.
Do this about 20 times. If light doesn't isn't optimal try again.
Step 4: Light Up!
You should be able to see Fiber Optic lights at the tip of each end. If this doesn't happen repeat steps.