Graywolf
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Try AC vacuum pumps on E-Bay.
craigslist..
I Got a Robin air?? stage2 4cfm for only 50 dollars
avg i see is 100-150 for a new to great cond 4cfm+
Maybe some discussion will lead to a more optimal method, for instance a electric vac pump that will take that pressure down into the -30 range.Either way its here now so enjoy