If nature abohrs a vacuum, why then does the universe employ one as the medium for the area between the stars and planets?
Many have stated: Working with a vacuum sucks, although, working with pressure blows. Working tables is what one does after getting a degree in fundemental geography, and not suprisingly, this is a prime example of a vacuum constant.
Use joint lube on glass glass joints,
Teflon tape on threaded connectors,
And when working with a vacuum, be aware that some labware is not neg.pressure friendly, and thus will implode at the worst possible moment.
Try to eliminate as many connections as is feasible, and also test the vac. pump to spec.s to assure that it is a sound unit at all levels of vacuum inducement.