Lower the front
In order to inspect the keel pin and bushings you must remove the four bolts that hold the two bushings near the forward part of the keel. A hydralic jack will do wonders in holding the keel up while you take out the bolts. I would try to squirt some liquid wrench up there and let it soak up the threads for a few days first. Once you have the keel the bolts removed, you can lower the keel a few inches so that it rests on that cinder block and piece of 2 x 4 you have out by the garage.If you lower the keel only enough to remove the bushings, but not enough to clear the keel trunk, it will not fall on you and cause bodily injury. If you like, you could build a keel brace out of those scraps of wood out by the shed.Anyway, once you have the bushings off, the keel pin will proudly display itself and tell you if it is in good shape or bad (that's the inspection part). Assuming all is well, you pump some MARINE grease into the bushings and put the whole thing back together. Torque the bolts to about 15 lbs and then wipe some underwater adhesive in around the bolt heads to keep them from wanting to come out.Have fun,Regards,Ted