The downstem can be omitted in a homemade bong, but it allows for further customization, like a diffuser, or a USB port. whatever.
Example- cigar tubes, highlighters, etc.
- poke a billion teeny little holes with a soldering iron for a nifty diffuser!
- its enough of a bitch to use any other material that I haven't found it even worth it, you should email me some if I'm overlooking anything.
- take a bic pen and wrap tape around it and you can make an awesome pull mechanism for your bowl/stem like so:
- douche bags bitch about plastic all the time
- slightly more effort, so dont worry about it for a temporary bong.