Originally posted by hotwasabipeas
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and then I had a lot of trouble getting a good seal. I think this is around the time that NS started to put groves in the gaskets. I even re-installed the old seal, (fortunately removed before it became brittle), to see if it was the seal causing the problem, and it sealed fine with the old seal. The only solution I have found that works, has been to get conical seals from coffee parts (700623) and machine then down to 8mm in my lathe, (I think 7- 7.5mm would be ideal). They never leak, but occasional if the dose is too much, the group handle will wind off while pulling a shot.
Does anyone know if the genuine NS conical seals, (02280020.C, same for the Oscar, Musica, and Appia) are shallower than 9mm at the tip of the cone? I have never tried the genuine conical seals.

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