I know where to purchase that; however, Mytee has discontinued that style, but I got rid of mine as well, and I made it the stack straight by placing it straight up without the ball cage or screen, whatever you want to call it. The newer mytee machines don't have the ball cage anymore; that is why mytee doesn't sell this part anymore, but they might have a couple available in stock. Mine also used to block the suction from time to time. Also, what I had noticed that when I was redoing the stack, the ball cage is a narrow-angle that will reduce airflow in the first place. My stack(s) are straight-up now, sucking directly rather than a narrow-angle, this will give a better airflow. I can take a picture of mine tomorrow and post it here.