Most of the canister filters have a beehive-shaped spring that holds the filter element down against the bottom so oil doesn't bypass the cartridge . There is a small metering hole in the center standpipe about 1/16" in diameter that controls the flow rate and prevents oil pressure loss to the engine.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!