a fun half hour project that give a pleasing result.
An empty lighter (I used bic mini as I had a thumbdrive for this)
A large nail (brute force is needed at times)
A saw (hacksaw's good)
a dremel or sanding block etc (smoothing edges)
Step 1: Knock the Ends Off
First take your saw and cut just on the line of the join between the body and the whit end cap, one this is cut off you may need pliers to pull bits of it out. Once the bottoms off you need a screwdriver or anything slim but strong enough the shove into the cavity and break the plastic bits of the inside off (creates more room)
After this pry off the metal part of the top and you'll see that the flint wheel is held between 2 plastic legs, push these apart to pop the wheel off and expose the flint tube, a spring and little stone like cylinder should have fallen out. Now take your nail and slide it all the way into the tube. Hit the nail with a hard blunt object, a hammer's good but not necessary. Shake out all the plastic that's now broken off.