I have seen something, cant find it had steel rings that slid in tight about half " thick or so > to screen >spacer>screen> with spacer on top to weight screen down. think that would do it? i guess you could make any screen config you are looking for on the fly.The bowl shaped end cap is actually an idea I ripped off from sean at ecogreen but he won't return my calls and I'm sure he has no patent, so fuck it, right? The internal diffuser was my idea though. Ok let's figure out the filter plate idea. I think all we need is the right size gaskets inside to sandwich all the screen together. I know where to get ss mesh down to 5 micron which is more than a fresh coffee filter will do.