Originally posted by Journeyman
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Not sure if the OP is still reading, but I ended up running the 3500 unpressurised and had similar issues with blowouts and the p/f locking in further and further to the right.
IMO the 3500 seal and group/handle interface just aren’t designed for the pressure of an actual extraction, leading to blowouts and eventually collar damage as the user tries to lock in the group handle harder to compensate. If I had to try and solve this problem, I’d be looking at adding a cardboard spacer under the group seal and possibly replacing the collar - but if the OP can afford to upgrade to a Silvia or similar it’s a bit of a no-brainer for me.
I didn’t persevere for long before upgrading to an EM6910/EM0350 combo which is still delivering great coffee every day about five years later.


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