Preheat. Like all espresso machines, if you don’t want a lukewarm first shot, you have to preheat the machine. Put some hot water into the water chamb...
Step 4: Sanding and fitting together the air chamber
Sand down the parts until they fit together like in the pictures.
You will also have to remove the inter thread of the union part that screws with tube and outer ring, unless you can get an unthreaded one.
Glue the two parts together using PVC glue.