Hi I found a Primus spirit bottle today which has a strange internal setup. I can only think that it would dispense a metered amount of spirits at a time. Hope my drawings will be enough of an explanation. A R5.00 coin is about the same size as a 2 Euro coin.
The bottles that come with the spout normally have the set-up like your drawing. This way, no matter how much alcohol is left in the bottle, one always gets the same amount of pre-heat fuel (approx. 10cc or slightly less).
