Tools
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            I show you the O-rings in the top piston of the brewgroup. I don't write much, because my english is bad, but the photos speak for themselves. Good luck 
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            Two screws, PZ 1 
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            Careful, there is a spring. 
 
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            Remove the piston. More information in my guide " Disassembling & Cleaning the Brewgroup" here. 
 
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            ...and then I found a crack in my piston. That can not be repaired. So I had to buy a new piston. 
 
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                            Conclusion
                          
                          To reassemble your device, follow these instructions in reverse order.