Bushveld,it looks like below the pivot is a screw the tumble stops on .what do you think possible? Mark
Yes, I saw that but in the photos you can see that the area of the tumbler that would contact the screw/bridle is cut away and radius in order (IMO) to not touch same when the tumbler travels forward. However, the issue of the tumblers not have a visible side plate anvil may be moot, because the Sauer gunmakers may have built the forward motion stop for the tumblers into the action itself.
You will recall our discussion of a Chilton lock on a 1889 Grant SLE that has no tumbler anvil.