Espressione Cafe Retro
Espressione Cafe Retro

I'm trying to replace the group gasket on my Espressione Cafe Retro machine can someone tell me how that is done. looked online and it said that a screw needs to be removed underneath the filter. I have the gasket and I see where it is supposed to go, I just can't figure out how to remove the old gasket and install the new gasket. There is a round fitting in the center of the filter with four holes on it. I tried turning it but it doesn't budge.
Thanks for any advice