Now that I have a bottomless portafilter, how do I use it?

"Here is an excellent article written by Dan Kehn titled ""Perfecting the Naked Extraction.""  Dan's article includes several images that show such things as  channeling, tiger striping, blond gushers, etc. Dan explains in detail things like what causes channeling and how to fix it. Click Here

Here is another well written article that won the author, Jon Rosenthal, second place in a contest sponsored by It contains several pictures and is very easy to understand. Click Here