If your spewing fluids when refilling, you may need an adapter.
This is more common with vintage or high end lighters.
Important note: You will also need to purge your lighter before refilling by shaking and opening fuel valve upside down until all the fuel(and remaining harmful by-products) are gone. This is an important step because even the best fuel leave some nasty residue and it is harmful to the delicate parts inside!
Butane lighters are not maintenance-free!
These are basically little engines just low compression. Let's see how long your car engine lasts by just refueling it..
Step 1: Determine If a Universal Adapter Is Right or Not
I don't think all the brands will be the same, so you might need to find one that works best or has the correct tip.
Step 2: Here Are Some Different Types That Should Fit Universal Tip
Pictured is a vector insert, old tiffany, colibri, and an old boy. All these work with the universal tip.
A thanks to all lighter makers that use the universal tip!
Step 3: Some Different Types That Need an Adapter
If it looks weird, it might need an adapter. Sorry I don't have more examples..
Note: Some high end lighters like a dupont may look like a universal will work, but they put a hole in the stem so you must use their adapter. :/
Step 4: Save Fuel and Money
It should fill without leakage if the right tip is used. And remember to save the good tips as different brands have different tips.
(although i don't have a tip for this old peterson in the pic right now, i do know, i can find one on one of those cheap blue $3 dollar cans that you see everywhere;)