I just purchased one of these Kila stethoscopes, the KL-770 which is very comparable to Littmann's Cardio-3. The rims on the diaphragm and bell are the same color as the rest of the stethoscope and diaphragm is rather ugly IMO. I have heard of people replacing the diaphragm with Littmann's tunable diaphragm for the Cardio-3. I am not a fan of these and I wanted to know if anyone has attempted to replace the stock one with the Littmann floating diaphragm. I'm sure the stock one performs just as well; this is simply for aesthetic purposes.