Recently I noticed that sometimes the portafilter creeps loose when I am pulling a shot.
It seems to be when pressure is highest and I assume the rubber seal is no longer as sticky as it once was.
What is currently the best place to buy seals, or does anyone have seal dimensions so I can just source one locally from a seal supplier?
I seem to recall a web site giving seal dimensions once, but can't for the life of me remember the URL.
