Try this link for adding an OPV: "Adding an OPV to a Salvatore Espresso Machine"

Been away....good to be back. Quick question--when replacing the solenoid, how are the pins and teflon washers EXACTLY oriented? The pin has a flared side and I'm not sure how to orient it within the washer: solenoid/flared pin end/washer/tapered pin end/base Or???? Thanks!

Check this out: "Another Bezzera Strega Lever Lube Job!"

Also didn't know that IMS made a Reneka-like micro pore basket for which I had no luck purchasing in the US...I see a UK espresso joint sells the IMS version....John49--thanks for the tip

Agreed- like putting a tourniquet around your neck to stop a nose bleed....it works and you'll never have another nose bleed, but... Have played with pressurized baskets, using good coffee--can do fun things with coarsely ground coffee-- but the "new" basket would have variable holes across the enti...

...maybe change the porosity of the portafiter basket-- might be kludgy to have a dynamic, mechanically variable aperture--maybe overlapping screens like a Reneka basket...????

Great start!-- coming back to filters, might also consider what happens when the filter is at the bottom of the puck, intimate with the basket

Brilliant video...really clever... says much about the company's creative thrust. I'm in to buy

This gizmo looks brilliant--curious about how many strokes are required for an espresso?

This poster on studying exothermic reactions during roasting looks very interesting: {link}