Does anyone know how to increase the suction on the Symphony? I am renting one from my lactation consultant. The first one started to lose its strength after about 3 weeks, so I brought it back, she said it wasn't creating enough of avacuum withher hand held tester thing, and gave me a different one. Well, just days later, that one started doing the same thing, so I brought in all my plastic parts and the pump, and sure enough, same thing. So now I am on my third. Is there any way to increase the suction, since it has started to go. My LC is vacationing in Europe for the next three weeks, and I'm needing some more suction! Thanks,