Oldmac, do you have any idea what that would be in degrees? I tried to figure it out but its making my brain hurt too much. I'm going to experiment here pretty soon, and I'll post my results. I'll be using a foodsaver jar attachment and a brake bleeding pump that has a vacuum gauge, cheap, simple, and might just be really effective. I'd like to try 1/30th atmosphere to start with if only I could figure out where thats at on the gauge.