I just want to say a few things here about shaving as a licensed barber.....
First off, the lather that comes out of the campbell machines is really NOT meant for face shaving, period. You CAN use it on your face but it's a little too thin and dries too fast. Most serious barbers do not use campbells by itself for shaving the face but instead mix it with another type of cream and/or glycerin making an "uber-lather" that is much better for face shaving. The campbells machine IS good for nape shaving which is what most barbers use it for nowadays. I've never heard any successful stories on making the lather out of the machine any thicker as it will clog or just not work at all.
That being said.....SUPPORT YOUR LOCAL BARBER! There are some of us out there that will give you an EXCELLENT wet shave.