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
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.