here's what i do with an empty thermacell bottle

1. i take a empty thermacell fuel cell and cut the end off that has the brass valve in to end of it.and your done with that end.
2. now turn the bottle over to the end that has the flat end and take a sharp knife and cut a half moon in the flat end.
3. then take and get a rubber or non laytex glove and cut the palm of the glove out.and then strech it over the opening where you cut the half moon shape in the end.and then take a rubber band and wrap it around the end of the bottle and make sure you got about a 1/4 inch gap between the plastic and the rubber glove.and then tune to your own satisfaction.and then you are done you should be able to call in a turkey with it.