We had a local build one of these and then give it away as a door prize at one of the past year's diesel get-together here in the pacific northwest.

It seemed to work well, and if I hadn't already been using my mighty-vac to do my brakes, I'd have that one in my garage.
(I've since been really looking at building one, as I fight with the mighty-vac each and every time I use it to bleed brakes...)

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-Josh
Testing the cheap Mercedes axiom, one bolt at a time...