The studios have been humming once again. Here, I examine the actuator plate, aka, mystery part.
The original 3-speed AW-NIG was designed in Nottingham in ~1984 for the Columbia Bicycle company. This hub did not have the actuator plate. An actuator plate made its first appearance in the 1988 AWC-NIG hub. If you have an old AW-NIG from the 1980s or 90s, probably best to not backpedal in high gear!
Despite being used in the AW-NIG & SRF3 (2001-present), the StAr, Sprinter, Summit and (W) five-speeds, and the ill-fated 7-speed, the actuator plate is shown but not identified on the factory exploded parts diagrams. I don't know how universal this part is; the one used in the freewheel 3-speed hubs is an HSA470.
Last edited by tcs; 01-20-14 at 10:42 AM.
"When man first set woman on two wheels with a pair of pedals, did he know, I wonder, that he had rent the veil of the harem in twain? A woman on a bicycle has all the world before her where to choose; she can go where she will, no man hindering." The Typewriter Girl, 1899.
"Every so often a bird gets up and flies some place it's drawn to. I don't suppose it could tell you why, but it does it anyway." Ian Hibell, 1934-2008
Thanks Dan, enlightening as always.
Any information, no matter how good, will always under-represent reality.
-paraphrasing J a r o n L a n i e r