heavy thing
hello ed, you will need more than one jack. on my 22 the cable end of the keel touches the underside of the hull ( i need to fix that ) so with a jack under the hinge end it wouldn't be able to teeter-totter to lower the hinge endso i would need to lift the aft end of the boat befor i could lower the hinge end. when i removed my keel,one of the mounting bolts snaped off and i had to drill out the broken bolt and re-thread for a heli-coil insert.if you need to remove the keel you will need to lift the boat allmost two feet off the bunks to clear the hulls' underside the keel is 500 lbs. or more. get the video from catalina directgood luck john