LONGER LASTING PENCIL Flaim TORCH.
I like these torches as they are but they don't last very long between refills.
Essentially I am knocking the head valve with torch and the fill valve off and replacing the center with a larger capacity tank made from copper parts. These little torches can get clogged after some time and you can remove the head and spray wash with carb cleaner or other. I have one of these heads placed on regular plumbers soldering tank using the valve part with this little torch lasts forever. Also, have another connected to a similar tank with a long hose to the torch. Both work well for small flame work.