Ask for help about the abnormal noise of Ohlins shock absorber
 

The Ohlins shock absorber used by my brz makes a strange noise during use. I don't know whether a friend has the same problem as me. I don't know if anyone can tell me that the problem is in the above place and what methods are available to repair it.
After the problem occurred, I replaced a new betrush tower top. The problem remained the same. I made sure that every screw was fastened.
The specific problem is that the sound of dongdongdong will be heard when crossing the road with poor environment

Because I publish articles with my translation software, I hope to understand

How many miles? Could be the top hat’s spherical bearing. Also IIRC ohlins need to be rebuilt semi-frequently.

Within 10000 miles, spherical bearing no problem.

Maybe endlinks.

I also hope this is the problem, but I have tested it. It has no problem at all, and it makes no noise when the shock absorber is cold. After driving for a long time on uneven roads, it makes more and more noise.