This is the website of the company that will work on your
Ball head (b1) Precision Camera in Niles, IL
I got mine back yesterday. Bob who owns the company said you will need to send it to him or Arca Swiss (who in turn will give it to him) to be repaired.
This is his website with good tips on care and treatmend of
the Arca Swiss ball headshttp://www.precisioncameraworks.com/
It only took a short time to get my ball head back.