Hi again evereddie,
Unfortunately something must have happened to the photos as I cannot see any?
Not sure of the "dots," but know of the "hook." On my backplate there is one halfway between the center and right edge; if there was one on the left side, it must have been broken and lost. I don't think they are critical though. If so, I can always glue a "retainer" as act as the hook to the back plate to help hold the spring. I am not sure of the L-shaped pieces though, maybe they are missing as well?
I tried yesterday to put things together, and unfortunately was not successful, breaking a piece off the dust cover on the right side near the end, and in the process breaking the hold-down as well. This time I am going to glue the square nuts into the hold downs with epoxy. I see no reason for them to be separate, and by epoxying them in, the pieces will be much stronger. Since the piece of the hinge that broke on the cover does not really see any stresses, just part of the hinge to hold the top on the backplate, gluing that should not be too difficult (finger crossed).
One thing for sure, to me anyway, is that this is a two-person job. To difficult to hold everything together, load up the spring and screw in the hold-downs at the same time. I will get help next time around after I've repaired the broken pieces.
Thanks again for your support my friend... I can be pretty persistent, so I expect to get there eventually ;-)