Throttle cables to ROTAX 912A2

Dear Rotax-owners,

We are having problems with the fine adjustment of the throttle cables on the Scheibe Falke SF25C equipped with a brand new ROTAX 912A2. The throttle is controlled by the quadrant levers in the cockpit, which then go to a splitter to control both carburetors. The entire system has some play, which hinders proper adjustment.
We are looking for advice on how to improve the operation of both the throttle and choke. If you have any suggestions, we would be very happy to hear or see them!

2 pictures are attached showing the levers and the splitter in the engine compartiment.

Greetings from Belgium