That posting goes back a couple years so it seems I got ahead of you somehow.  I remember that picture, so I must have found it before, in preparing to convert my first one.

I just had a brain-wave, while looking at another 3-phase motor I had and realized that I could take out its rotor, turn it down just a bit, and it would fit into this Baldor.  No risk of making things fall apart turning the rotor down too far.  Also a bit of trimming on the bearing shoulder to get it to the right length and ready for magnets!