Do you need to tighten the locknut after adjustment?

I made the adjustment from the top, using open wrench. And I just touch the brass screw. Without touch the black Locknut.

Now the cover is on and i just afraid it will loosen up by it self, as i don't check the lock nut before i put the cover back on.

dsblv wrote:Yes, two wrenches is all you need.

I'm also looking to reduce the pressure on my Linea Mini. I've got the scace II already.

What size do I need these 2 wrenches to be? thanks,

--mike

I reduced the pressure to 6 bars at the group head. All I needed was a 10mm wrench and I opened only the top. (I have a 2020 Linea Mini, and maybe this is why I needed 10mm, not 11) A bit tricky to get the hold of it in the beginning, but once you get it, it's actually pretty easy.

Yes, my 2020 Linea Mini brew pressure adjustment also requires a 10mm wrench. And I didn't need to loosen the locknut either. Just as well, since getting two wrenches down there at the same time would be tricky.

I wondered about drilling a hole in the back panel to make access easier. You could maybe also install a control knob for pressure adjustment.