Sturmey Archer HSA470 Actuator Plate
This is the actuator plate that fit at the back end of the free hub body/ driver on large number of Stumey Archer gear hubs.
It is compatible with a number of Sturmey Archer hubs, including but not limited to:
Sturmey Archer S-RF3, both N and regular version
Sturmey Archer S-RF5(w), both N and regular version