I really need help. (Hopefully with a Herbie style drain)

[Marlin65]

Originally Posted by rocketlily

"on top of the durso... do you have a hose for air to get in? try adjusting the hose up or down to let the right air mixture in"
On top of the durso is a cap with 8 - 1/16" holes that I can cover/uncover.

I would say get rid of this cap and put on one with a single 1/4" piece of hose that you can adjust up or down, and if that does not work you might want to look at changing some of your plumbing Sphelps way.