Does anyone remember watching Alene's Creative Living several years ago? When they needed a fine line of glue, they wrapped tape around the tip of the glue bottle, kind of in a spiral form towards the tip, and it left a much smaller hole for the glue to come out of. Not sure if it would work with the Elmers but it did work with Alene's glue bottles.
There are still some shows on YouTube, but not sure if they show how she did the glue or not.