Adams Rite 4561 For operation of 4700 Series Deadlatches (except 4750) & MS+1890 Latch/ Deadlock. An activator cam plug is available seperately that mounts on the handle escutcheon & fits solidly into the cylinder hole of the latch. Downward action on lever handle retracts latchbolt. When used with MS?+1890 Latch/ Deadlock, 4580 Cam Plug is..