3. The alcohol burner.
I also have greatly simplified the burner. It is simply made of a metal tube with a loose lid on iin what pipe is soldered for the cotton wick. The burner is more or less stuck placed in a hole through the mounting plate and the wooden base and can only be turned around to set the best position of the flame relative to the flame hole. I prefer to use alcohol 96-98% instead of household spirits because a spirits flame is less hot and causes more pollution of the piston and cylinder.