Amazingly it does work. I'm used to having to really wedge the portafilter in hard to get a good seal, but it seems even when it feels 'loose' it's actually pretty well sealed.
How do I know? Pulled off a shot and put the steamer on - absent-mindedly forgetting to take off the portafilter, which is what you're supposed to do before frothing. Went to take off the portafilter, sound like a gun went off, portafilter flies out of my hand, coffee grounds all over the kitchen.
Amazingly it does work. I'm used to having to really wedge the portafilter in hard to get a good seal, but it seems even when it feels 'loose' it's actually pretty well sealed.
How do I know? Pulled off a shot and put the steamer on - absent-mindedly forgetting to take off the portafilter, which is what you're supposed to do before frothing. Went to take off the portafilter, sound like a gun went off, portafilter flies out of my hand, coffee grounds all over the kitchen.
I think the seal's good...