Hi all, I have a littmann classic III and it came with two tunable diaphragms, a paeds one and an adult one. I have removed the paeds one to get an open bell instead. But I am confused now, how hard do i press down on the diaphragm side to use it as a diaphragm? Because it is still tunable on that side right? if i press to hard, all sounds go away. Conversely, how hard do i press on the bell side? do i just rest it without any pressure on top? Sorry if this is a dumb question im just really confused and would appreciate any help. thank you!