Play in the geared head

My Manfrotto (or Bogen) 410 geared head has developed play in the altitude gear. I took the head apart a couple of times, but everything looks just fine, I cannot figure out where the play comes from or how to fix it.

Any ideas?

Dmitri

I have 2 Bogen 410's.

How bad is the play in yours? That is, is it interfering with your observations? Does it hold position once you center it on an object?

One of my 410's has a little play but never enough to create a problem.

Rey