Awesome! I don't understand the need for the scrunched up tin foil wrapped around the inner wall, what's that for?Sent using my chubby fingers...
the crumpled foil serves as a wicking material drawing the liquid fuel up through the crinkled channels to the large roles at the top of the sleeve during which it evaporates to fire the smaller jet ports on the rim. This is possible due to the surface tension and ability to flow that all fluids have allowing them to climb or "wick" through fibrous materials or closely spaced surfaces, even metal ones. Perfect examples are how a book or news paper wet at the end will draw the moisture between its layers beyond the saturation content of the paper itself, or in metal how when solder tinning wires the solder is drawn through the strands from the pot even though just the tip is touching, and in plumbing how sweeting a copper pipe draws solder between the layers of a copper joint rather than just on the surface where it is applied.