I just dealt with this on the 34 year old KitchenAid I just got. The spanner nut took a while of tapping but finally got it off, only to find that the basket and drive bell were practically fused together. Spent hours last night periodically squirting Bolt-Off and hitting all over with a rubber mallet, pulling every which way, rocking as much as I could while worrying I might damage the frame or suspension in the mean time. I continued today with the same treatment, but what finally got it loose was combo52's advice on an old thread of screwing the spanner nut back on about halfway, pulling up on the basket while hitting downwards against the nut with the hammer, until suddenly the sound of the pings changed, and at the point it wiggled and I was able to pull it out. I had already bought a new spanner nut and the wrench for cheap, so I wasn't concerned about damaging the nut at that point.