Clean your Stream Machine. I used hydrogen peroxide because it wont harm the acrylic at low concentrations.
Drill out the hole in the end of the barrel to fit your female piece. Step up your drill bit size slowly so you don't crack the end cap.
Test fit your female piece. Drill the whole slightly larger than the glass part to accommodate the rubber stopper.
Pull out the small gasket that block the four smaller holes in the end cap if it becomes loose. You'll have to plug these holes. I used duct tape.