Could it just be the wind up of the spring caused the adjuster to back off? Solution would be to sparingly put a little oil between the backing plate and spring, and the spring and the adjuster cam.
The original was, as Lynn says, likely peened at the cam. The peen could be ground off (in situ...no need to remove the backing plate), the "snail" removed, and a suitable spring put in place. A cut open socket or piece of tubing could be C clamped into place to hold the cam in place, and a spot of mig weld put on to secure the cam. The heat would have to be kept to a minimum in order to not destroy the tensility of the spring.
The proper way would be t have the backing plate on the bench, and the cam would be put in place with a staking tool. We had a C-clamp for that purpose with the Iltis series of vehicles.
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