How about using a vacuum pump like those used to purge an A/C system on an automobile. They're pretty slow, but it is my understanding that they really are powerful. Like this:

https://www.harborfreight.com/25-cfm-vacuum-pump-61245.html

It is rated to 10 Pascals. That is .0001 BAR. Anybody understand all that enough to know if it would work, or if that is enough vacuum?

SRH


May God bless America and those who defend her.