ever made jewelry? ever done dental castings? there are oil pumps out there that will pull 29.9inHg for under 200$ new even some parellel diaphram pumps will get that low and some are solvent safe. keep looking, the auction site we all love (or hate as the case may be) will give you great info for brand names, also might be worth looking into refridgeration repair, some pumps there are perfect for what were all working for, also look at asperators dirt cheap and will work for just about everything