Incidentally there are some photos of FD55s in bits and being
re-assembled in a couple of my flickr albums :
https://www.flickr.com/photos/tony_duell/albums/72177720302114987/
https://www.flickr.com/photos/tony_duell/albums/72177720304931970/
They cover the complete computers (Stride 440 and Philips P2000C) so
most of the photos are not of the drives, but there should be some
that show the head positioner, etc
And here's a home-made version of the positioner-moving tool. Not
essential, but it's useful to have.
-tony
https://www.flickr.com/photos/tony_duell/albums/72177720302945215/