What u gonna need; push pin, can o butane, dremel tool, and an empty lighter.
Step 1: Dremel It
Dremel out a hair, like less than 8th or chip it safely, I won't be held responsible. Little Bic this step is not required.
Step 2: Punch It
As seen on next step
Step 3: Punch It
Use a push pin jab it right through the middle. These things have made a fortune of us, not anymore.
Step 4: Fill It
Just like a refillable, tip the butane up and fill. This should take approximately 5-10 sec depends entirely on the amount of pressure in the can.
Step 6: Plug It
This is the trickiest part, but for a professional lighter modification expert like I inspire to be it is overshadowed by glory. As soon as that can comes off the lighter put yo finger over it, followed by a push pin.