4 plastic mounts at the bottom of yor screen making it adjustable fore and aft, and up and down. Stops buffeting for most folk. Manufactured by Mr Tobin of this parish, aka "Tobers".
Tobinators - a magical device that miraculously solve the problem of buffeting from a GS screen.
OK so that's over-egging it a bit. They allow you to adjust the screen, which in turn alters the airflow, reducing buffeting and potentially turbulence.
They are bolt ons so you can adjust your screen up/down back/forward and tilt angle. NN's do em worth a try if you are getting a lot of buffeting from the screen, but take a while to get the right position for 'you'.