title_body: My home machine is broke. The single basket works but the double basket doesn't. Can baskets be broken/worn out?
upvoted_answer: It's basically impossible for us to know what exactly causes the problem, but it does seem to me as if the basket is clogged with something. Probably built up residues of the coffee and fiber that's stuck in the small holes. It could of course be the pump, but then water would definitely flow out if you run it empty and the single basket should be affected as well.
  
  If it's clogged filter you can try soaking it in hot water with an espresso machine cleaning detergent over night. But since you already soaked it in vinegar I don't think that would be fruitful.
  
  You can also, carefully, put the porta filter over a gas stove to burn the residue. Hold it over the flame for a bit until it gets hot enough to burn it, then tap it against your kitchen table or some other heat resistant surface. That should do the trick. Afterwards you can clean it again normally and it should work again.
  
  Lastly you can of course push through the holes with a very thin needle, but that is quite tedious work and would take a long time.