WI_Hedgehog
You bought a WHAT???!!
You are right! The MightyVac MV8500 scale is PSI on the pressure side and inHg on the vacuum side--thank you!Pull 15 inches of Mercury, if you pull 7.5 vacuum, that about 3 psi. Too low.
Thanks for the tip. Pulling on it helped, turning it several rotations seems to have "lapped" the surfaces or at least cleaned it up better than I did (and I got it "clean" from what I saw). It now seals well so I won't use it so it doesn't carbon up (probably doesn't matter much in the big picture).Decomps will almost always leak at 7 inches of vacuum. Usually pulling out on them slightly will seal it off.