Thanks @The-Engineer-That-Brews , yeah, this was pretty much my thinking too. Not expecting to be brewing again for a couple of weeks or so, so that gives me a bit of time to have a play and a test.Perhaps it would help to add an ‘O’ ring or thick rubber washer on the shoulder of the adaptor where it butts up against the body of the filter? I got a mixed set of different size ones from one of the online sites and they come in handy remarkably often
Will check out eBay for a set of washers/o-rings
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