Lelya 2 experts...

[JWilson]

There are many.

Here is one that covers many things.

https://youtu.be/heie6yNXCyY

 

[zeravince]

Problem solved , I swap with another lelya at store, no puff and no ping. Get the best one

 

[zeravince]

This one no air puff at all, but just a little bit ping in the ear. Also try to buy a silencer to make it very silent. Thank you for the diagram and the advise guys so next time if I have loud problem I will try to fix it by myself