A slight detour...
While working with the stalk last night, I noticed that the seat for the stalk is just barely the same width as the stalk. When I install the servo system later, the stalk may produce a little unwanted friction when operating.
Looking at the screen-used helmet, I notice that the correct way to avoid this is to sand the seat toward the helmet, as the seat is not quite as thick on the movie helmet. However, I didn't want to take a chance on sanding too much or sanding unevenly.
So I took a spare piece of 1/16" styrene and made an 'extension' to widen the gap a little. I'll glue this to the exisiting seat, and putty/sand the edges until they're uniform.
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More to follow...