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Do you have infinity focus with the 135mm Alex? Direct mount following removal of the old mount and intermediate ring usually results in focusing way beyond infinity on nFD lenses unless a custom spacer is used under the EOS mount.
Yes, I do have infinity focus. There is no need to use a spacer. I just thinned the EOS mount (M42->EOS) down to 1mm, and kept the original nFD base mount (deepest ring, where the 4 flat screws are). Removing the 2 groves of that base mount allows to use the 4 original flat screws. To reach proper EOS register distance, I just screwed the thinned EOS mount on top of it. If I find my measurement drawing I will post it later.
Now working on converting a 500/8 nFD to EOS. Even easier (no aperture)