The systems, however, have a reputation for being complex and costly, discouraging many amateurs from bringing vacuum techniques into their laboratories. But this need not be the case. Vacuum systems adequate for many scientific needs can be easily built and inexpensively maintained. Here's how to construct a system capable of achieving pressures as low as one ten-millionth of an atmosphere. When it comes to vacuum vessels, think small.
Low volumes are easier to seal and pump down.
It should be larger than the jar's lid. Secure the lid to the base plate with a generous helping of aluminized epoxy. The epoxy should ooze out evenly from around the lid when the lid is pressed into place under the weight of a few old books. Wipe away the excess and let the epoxy set. Next, drill a hole one quarter inch in diameter through the center of the lid and the base plate.