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@Aroogah
I just did some more work on my Brugnetti. I replaced the leaky grouphead gasket, descaled the machine, and then cleaned the shower head and diffuser - both of which were black with remnant coffee bits. Check this out.
Bleargh.
I also followed a technique from the coffee-tips fairy and cleaned the burrs in my Porlex by grinding a load of Grape Nuts. Worked quite well actually.
Freshly ground coffee, clean machine, all set to go and........cue unpredictable spewing from the naked PF. Not a nice clean pour at all. Most of the online guides seem to indicate it's either grind, dose or tamp. Or all 3. Gah! Fucking coffee? How does it work?