I took pictures to write a full Instructable on this project, but earlier this week, there was a shooting at a high school near me, followed by two bomb threats in different nearby high schools. In light of those events, I have at this point chosen not to make a comprehensive step-by-step. I am confident that if you want to make a wrist-mounted flamethrower, you will be able to figure it out by looking at this and all the other videos of them online.
Thanks for watching! Be safe, have fun!
*This Instructable is entered into the Extreme! Challenge. What could be more extreme than shooting fire out of your hand?