There's a moderately heavy spring under the lid that holds the filter element down, and it can launch the lid across the shop when the rubber gasket lets go. Leave the top bolt engaged 3-4 turns before you tap the lid loose!
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!