Hi there,
I'm a new member who doesn't know much at all about espresso other than what I have seen on Alton Brown's espresso episode.
Anyway, I bought an Oscar and a Pavoni Zip base grinder from a yard sale for 50 dollars (seriously, long story attached but I will make a new post about that and both of the units are in perfect working condition).
My Oscar has the same exact setup as the original poster's machine with the apparent pod diffuser setup:

I want to put the correct ground coffee diffuser in place but I have no idea where to order it or what to ask for.
Can someone tell me what exactly do I need? Does it have to be made specifically for the Oscar or are these diffusers pretty standardized across the board?
Please be gentle, I am a total newbie at making espresso!