RE: Stanzel 1/2A Mono-Line Unit
Jetpack,
To use the monoline system you will not only need the actuator in the plane but also solid flying wire and a monoline control handle. Monoline controls the plane by twisting the wire, which moves either a spring-like cam (your pic) or a worm gear (the speed units) to provide control movement.
There is a Stanzel museum in TX run by Dale Kirn who promoted Monoline for Vic Stanzel, the inventor of monoline. I believe Dale has the last of the monoline units, if no one here has one.
I think most built the Berkeley Skyray as a FF model. For goodness sake, don't use that aluminum impeller as the duct fan.
Good luck with it.
George