I had a few original shocks rebuilt about (7) years ago to where they did not leak, "much".
Also, they offered good resistance.
However, when tested with a device similar to the K.R. Wilson tool described in
Ford's hard cover bound Model A Ford Service Bulletins, Figure 1116 ............. two (2) had resistance in the correct direction, and two (2) had resistance in the wrong direction.
No doubt many have received rebuilt shocks, moved the arms up and down, felt resistance ............ but never noticed that some rebuilt shocks were provided with incorrect internal parts.
Next, ordered all new shocks ...... glad I did.