2" of mercury is not much. I helped a friend make rubber molds, he had a vacuum chamber that would pull down to a near vacuum (nearly 30" of Hg) to get the bubbles out of the liquid rubber. It was essentially a pipe with a plate welded to one end, a lid, an air compressor set to draw air from the chamber, and a couple of valves. 2" is not a lot of vacuum, about 1 psi, compared to 14.7 psi. How many pickups do you want to do? What are you using for a vacuum chamber?