I open the carto, tilt it, hold a tissue on the threaded end hole and make it take 18 drops per ml (a Boge is around 1ml). I drip down onto the inner wall and let it slide into the stuffing as I rotate the carto. The first drops soak in slow and once the stuffing is damp it goes faster. After I get 18 (or more is if it seems eager for more) in I wait about 30 seconds and then see how many more drops it will soak up easily - one at a time. Then I clean it up on the threaded end, then tilt open end down into a tissue and puff into the threaded end to clear the air channel, Then I touch a soft bit of tissue to the top of the stuffing while it is pointed down (to sop up any loose juice), Then I look - I want to see light through that air channel. Then I let it settle 15-20min, laying it on different sides.