unused fuel?????I used a maverick bourbon can...same size as redbull....and kept making it shorter untill got the fuel capacity right for a 750ml boil....but mine is more simple version than yours...just two can bases inside each other with holes in top one,3 in centre for fuel in,covered with coin and numerous tiny holes around top rim to allow gas out....it fits inside folder hexicooker so about an inch high.
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