The goal of this was to remove the "wheel" which locks the trigger. After I bought this, I found unlocking this trigger took some practice and I didn't like the way it made using the lighter so difficult. Of course your situation may be different. We have no children on the premises so I didn't mind leaving this trigger interlocking device off.
My disassembly instructions are brief and in some ways redundant to the more detailed step-by-step Scripto Lighter breakdown posted by an earlier writer at: http://www.instructables.com/id/Scripto-Lighter-Teardown/
As this is my first DIY instructable I wanted to practice photographing a project that had small pieces and using a SmartPhone camera. The phone is a T-Mobile Huawei called MyTouch. The Smartphone's camera is helped by viewing the small objects through a handheld strong magnifying glass. No flash was used. All photographs were done with the morning sunlight pouring through a window.
First, remove the small Philip's screw with a Jeweler's screwdriver, which comes in sets from places like Radio Shack. There is only this one screw.
The red plastic case splits in half but won't come off right away. It is held in place by a sleeve. Tug at it and slide the sleeve off. Also there is a self adhering label on the seam. Peel that off too. It was later used to cover the hole where trigger interlocking "wheel" was found.
A SPRING IS HERE.... BE CAREFUL, there is a spring that can fly off if you are not careful when splitting the case apart. This is where it belongs.
Another view of the "wheel" and how the lighter fluid tubing passes through it.
A close-up view of the "wheel" and the spring. Note there is some white lubricating grease on the prongs. This wheel is a half-round and not truly a wheel that can spin.
Screw it back together and it's done. After reassembling, to keep dirt out I taped the hole where the trigger interlocking was designed to be.