Hi I have a very similar problem. In my case the white plastic is dislocated. Did you got any answer from Sennheiser or did found a solution by your self ? I posted about my problem here: https://www.head-fi.org/threads/sennheiser-momentum-repair-disassembling.923053/ I managed to remove the...

Hi, I want to repair a Sennheiser Momentum which I bought some days ago (in used condition) without realizing at that time that the left ear cup have some problem. As many people may know the ear cups of the Sennheiser Monetum are mounted on guide rails. Here is a picture of the sound right...