If you want to roll your own, you will likely end up with a lot of splattered smoke oil on the floor and a lot of trashed SS tubing in the garbage.... Just spend the 15 bux and get a ready made tube (or 2) from Tam.... I tried various methods of creating the nozzles but nothing works as well as a store bought tube.

the skywriter pump works great...

The photo below is with the sullivan pump on 5 cell nicd and a single tube.....