I use both Medela Harmony and Avent ISIS manual pump occasionally if tiring attach to electric breast pump or I have to take care my baby or want to move around or go outside without my baby. From my experience I can say that:
1-Stick the membrane in gently,
2-Stuff the funnel / flange into the connector
3-Screw on the standard size Medela bottle
4-Clap on the pump handle and I’m good to go!
To start pumping, you need to turn / swivel the pump handle around until you have the short end in your fingers. The Medela Harmony is in “stimulation” mode. Once you’ve achieved letdown, swing the handle around to the longer end and you can begin to express milk with a more powerful suction.
