When changing a group gasket, which way around should the new one fit?
Most instructions I've found don't mention it, though one video I found says the rougher side goes towards the portafilter (Changing a Group Gasket on a Rancilio Espresso Machine - YouTube)
It seems the rough side would make a better seal (also, on the replacement I just received, the shiny side has a logo which presumably would affect the seal).
Is rough side down the go? Does it matter?
Most instructions I've found don't mention it, though one video I found says the rougher side goes towards the portafilter (Changing a Group Gasket on a Rancilio Espresso Machine - YouTube)
It seems the rough side would make a better seal (also, on the replacement I just received, the shiny side has a logo which presumably would affect the seal).
Is rough side down the go? Does it matter?

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