Hi and thanks Logieberra!
My imaging setup is here, minus the rotator
http://frostlandobservatory.galleria...maging+system/
Gemini`s man thinked that the mirror cell is not the problem, but the direct attachment of the focuser.
At first I contacted to Astromeca, but they were too lazy to answer and I did not get good feeling about them.
I`ll try to ask from Telescope service and GSO about the new cell.
I`ll answer more properly when I'm out of work.