Stupid question here, but are the domed screens meant for herb with the metal bowl or are they inserted into the head?
First, both the metal and the glass bowl are diffusion based. The metal bowl has a built-in "hard screen." The glass tube employs domed screens as a flexible distancing bowl.
I have given up on the glass solution. Too fiddly.
But I have ordered an Arizer ArGo WPA that's all glass and fits the Hornet.
I've also ordered an 18mm glass bowl that "may" fit it as an injector. We'll see in a half year or so (coming from China).
And finally I've got a Dynavap tip and Bonger coming this Saturday.