i revisited my diffuser on my mya diva about a week ago.
i hated how it restricted the pull so i made some adjustments. i slipped it on the stem, enough to where it'll stay on, then i screwed the stem down to my vase so that the diffuser gets pushed up according to how much i screw in the stem and left it at that (the instructions say differently).
it's like i'm not using any water, no sound, no rattling from bubbles and the pull is still the same. i kinda like the rumbling sound though.
Less drama, more hookah!