Hi gstott,
FWIW, from past actual experiences:
In addition to #4 above ...... with a Model A driven, even occasionally .... after 80 years,
1. On the driver's side and passenger's of what was thought to be well lubricated Model A spring leaves, these leaves, (with either original spring leaves, or later installed repro leaves), all of the upper spring leaves will wear a depression down below, and a very precisely located dam at the outer end of this depression into the lower spring leaf directly below.
2. After some time, with wear, when these springs "try" to flex in shear, they move slightly until the 90 degree outer edge of the upper leaf contacts lower steel dam on the spring leaf directly below.
3. Not much different from the old adage of moving forward and immediately stopping after: "Running into a brick wall."
4. When the upper leaf contacts this abrupt lower leaf steel dam, the front and rear spring leaves no longer flex, and this Model A has absolutely "NO" springing action; similar to totally removing the front and rear springs.
5. At this point ........... just "think"! ....... How can a Model A with "NO" up and down spring movement cause a Model A shock arm to move up and down?
6. Several articles are written on how to employ a side grinder to remove the dams in the tops of the lower spring leaves and how to ease the bottom ends of upper spring leaves to "completely" fix this situation for either old springs or new Model A springs.
7. Several articles could be found under "Search" written on adjusting shocks per KR Wilson tool method described in Ford Bulletins, indicating amount of weight required, distance from weight center to shock center, and time for weight to fall at different temperatures.
8. All of the other methods thus far written for adjusting shocks by backing off the adjusting bolt 1/8, or 1/2, or 3/4, I found were about as accurate as dipping one's finger in ice water, and holding it behind a Model A engine fan in order to estimate Model A engine horse power at different RPM's.
Just hopes this can help anyone searching for information in the future.