with a "ratchet" head you dont need a screen just put the weed in there it will stay. if you want you could make a screen out of tin foil.
Pulse Reviewed by Pulse on . grav bong filter ok so i constructed a grav bong outa the ol' 2 liter bottle, with a "ratchet" head ( i think thats waht they're called) stuck in teh bottle cap for a bowl. but i haven't done this in forever and i forget how i used to make a screen so the weed didn't pull through into the chamber! someone help!!!! i forget!!! im a noob!! Rating: 5