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Sorry no write-up to share (yet). FD conversion's trick (for simple lenses) relates to linking the aperture mechanism. Here is how I do it, with small aluminum plate & 1 screw:
Pic was taken when training on a basic 35-70 for the 85L, which is a different ball game with its rear element.
Yes, that and the non-standard screws that hold the body to the mount frame. You can't find flathead thread forming screws, not to mention longer ones.