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 ear cup.

As seen on the picture there is a white plastic on which the ear cup is gliding on the guide rail and enables the user to adjiust for size. The main purpose of the white plastic seems to be to hold the ear cup firmly on the adjusted position.
On the left & broken side this white plastic has jumped out. I disassembled the ear cup to asses the situation and took a picture of it.

Removing the ear cup was easy but now I stuck because I am not sure how to disassemble the ball joint / capsule without to do further damage. There is a thread on the top of the ball joint on which the ear cup can be screwed but nothing else.
On the other side there is a glued Sennheiser faceplate.

Does somebody have an idea how to open that kind ball joint? My hope is, that the white plastic is not broken but only displaced from its original position.
Thank you
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 ear cup.

As seen on the picture there is a white plastic on which the ear cup is gliding on the guide rail and enables the user to adjiust for size. The main purpose of the white plastic seems to be to hold the ear cup firmly on the adjusted position.
On the left & broken side this white plastic has jumped out. I disassembled the ear cup to asses the situation and took a picture of it.

Removing the ear cup was easy but now I stuck because I am not sure how to disassemble the ball joint / capsule without to do further damage. There is a thread on the top of the ball joint on which the ear cup can be screwed but nothing else.
On the other side there is a glued Sennheiser faceplate.

Does somebody have an idea how to open that kind ball joint? My hope is, that the white plastic is not broken but only displaced from its original position.
Thank you