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I bought a brand new Professional about 6 months ago and it has been producing very acceptable coffee. But I pulled it apart anyway.
I found:
The inlet pipe had only been screwed half way into the nylon group connector. But as it had been cross-threaded and was hanging at an odd angle this was probably a good thing.
The group connector itself had never been tightened. It was about 3/4s in.
The piston shaft had never been fully screwed into the piston. Some sort of weak as piss threadlock had been applied but the whole thing easily came apart.
Nothing - no seal, gasket or o-ring - nothing had ever been lubed.
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