Several ways to attack these spindles, try clamping the blade adapter in your vice and twisting the pulley back and forth (with your hands only) the key could be starting to shear and sometimes part of the key gets pinched between the pulley and the shaft. If you look closely you can probably see where the keyway in the pulley and the keyway in the shaft are slightly out of line with each other.
IIRC, the "O" deck spindles will come apart from either direction, you should be able to take the blade adapter off of the bottom and tap the shaft upward through the casting and bearings (don't mess up the threads).
Might try taking the grease zirk out and either put a small bolt in the hole so that the head of the bolt rests on the end of the shaft and then tap the head of the bolt and "drive" the shaft out of the pulley.
Gotta be careful with the cogged pulleys though, they are pot metal or some other fairly soft metal and they can bend/break easily.
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