Very cool. I know nothing about these types of actuators but you're right that they seem pretty robust. When I heard actuators I was thinking of the common ty

Very cool. I know nothing about these types of actuators but you're right that they seem pretty robust. When I heard actuators I was thinking of the common types that definitely don't last forever :) Unrelated: reaction wheel assemblies (used for attitude control) typically would have one extra wheel as a "spare." Redundancy is important enough on spacecraft you expect it wherever it is practicable. I used to work in aerospace - spent enough time coding spacecraft simulation tools that I had to develop at least a working familiarity with how some of the common satellite bus systems are supposed to work :)