Steamwand Quickmill/Poccino

[marmhz]

My uncle has one of those Poccino machines which are quite similar to the Quickmill 810/820 series. The problem is that the steamwand is leaking water during espressobrewing so there isn't much pressure on the puck.
I found out that the valve that has to shut the watersupply to the steamwand if it's fold up is not working properly any more. I can order a new steamwand which is not very cheap so I thought maybe there's a TMC member with a better solution.