Thanks for the input guys. I'll look out for another field phone shortly, got to get Christmas over first.
I've never seen a rigid knob on a handle; it seems to be designed to allow cranking whilst preventing one's fingers from slipping off. Could you remove the handle from the generator and soak them in oil overnight before attempting to unscrew the knob from the handle?
The handle can be removed from the magneto, what can't be removed, is the small knob at the end, a generous spraying of WD40 has produced no results, there's a screw in the centre that's defying all attempts to loosen it.
