Hi all - I just found an immaculate Sturmey Archer Filter Switch Unit and I want to install it in my 1969 Superbe (yes, I know it's not original). Can anyone out there supply me with a diagram? Also, when the 4 wires are hooked into the 4 connections in the top, how do you get the chrome cover back on? Thanks - Mike - PS - this is my first thread, ever, so I don't know what I'm doing.