Seized frothing knob shaft
What's up Guys? So, having a problem here. I've got a seized frothing knob shaft. It got so bad that I could barely open/close the valve with the strongest grip I could muster. Obviously this affects the brew pressure since it doesn't completely close all the way. I removed the plastic knob from the splines of the shaft, but I'm now at a loss as to what to do next. I've included a pic from above with the cover off, and highlighted the shaft in question. I'd be grateful for any help as I really cannot afford a new machine.
Is this a good question?