The Littmann's stethoscope is an everyday tool for a doctor, but earpiece are easy to lose and sometimes difficult to find in shops.
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I have lost one earpiece of my stethoscope, so I have replaced it with a hand-moulded Sugru earpiece. Unfortunately I ran out of Sugru, so I could do just one, and the color is not the same, but at least I can use my stethoscope without hurting my ear.
Make sure you cut a hole in the earpiece.