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The u-cup shaft piston gasket, over time can lose its efficiency and cause some small leaking, especially in the initial phase of heating

I used, to solve the inconvenience, a rubber washer in silicone, but to avoid damaging it while inserting the shaft piston, I propose a different way of replacement.


disassemble the shaft from the piston


put the new gasket


put the ring nut


put a little bit of  lube and insert the shaft


screw the ring nut


put the spring


put the piston body


screw the piston body


(a big thanks to Marcel Speek for the suggestion)





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