I have a Littman Master Cardiology series stethoscope. I was generous and let one of my fellow classmates use it since she left hers at home. Well she used alcohol on the diaphram (which we should do), however, she pushed really firmly on the diaphram on the stethoscope. I am freaked out because the stethoscope cost 180 dollars. I did take a B/P afterward and was able to ausculate the B/P correctly. However, I am really concerned she messed up the cardio aspects of this awesome stethoscope. Am I being too OCD or am I right for being concerned? Thoughts? Thank you in advance.