I recently picked up two .44 Hand Ejectors ("Wolf & Klar") only four years apart. One is #28179, which dates to 4/27, the other one (with "pawnshop engraving") is #34451 and dates to 3/30. The last patent date on barrel of the earlier one is Sept. 14, 09, while the last date on the newer one is Dec, 29, 14. In working on these I found two distinctly different sideplates, with the newer one having a spring-loaded gizmo which I assume is a hammer block. Can anyone clarify this? I don't see any reference to this in any of the four S&W books I have.