rotary carbs!!!!!

[maxx-breaker]

I need some serious help with this rotary carb that i got on one of my motors. Well here is my problem. I am trying to figure out how you prevetn the carb from completely closing and cutting off air to the motor when you put the brake on. I have never messed with one of these before, and have no idea what i am doing. It is set up , to where you out the break on, it pushes against the carb to where it closes the opening and kills the motor. I tried tightening it up , but then it wont open or close when it is to tight. Help please...