steering wheel

it seems like it should be the simplest thing to get the original steering wheel off to replace w/stainless, but the darn thing won't budge. took the nut off, and either the hole/keyway is frozen to the shaft, or i'm missing something. sprayed pb blaster in it and waited a day, still won't budge. am i missing something, or is it frozen? i guess after 25 years the metals may have corroded together, but i really want to put my shiny new wheel on. any suggestions?