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Thanks for the offer. Let's see how it goes when my normal basket gets here.
I'm just conscious I'm playing with grind size while also now dealing with an unknown pressure. Reducing the variables seems important.
I did the OPV adjustment last night, and used the "not quite blind method" of seeing how much water comes down the return pipe in 30 seconds with a blind basket in. As I've upgraded the pump a while ago (not sure what to) I'm not sure if that effects how much water I should see through the return pipe, but it appears I'm in the right ball park.
I have a gauge you can borrow but getting hold of it from me will be tricky as I'm not in london very much at the moment.
I did mine blind and it was close enough when I checked after the first go i didn't bother to re-do it i think. I'd say give it a go and see how you get on and borrow the gauge later on to confirm if you're not having any luck.