Maybe, but the dowel/hammer trick will develop several hundred pounds of pressure, maybe 1K or more, and it's a quick shock effect, not a constant pressure. It's worked for me on a lot of occasions. Follow up with air pressure if you want to, to confirm the passages are clear.
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!