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@DoktorSpoor
Hi mc nebula,
are you talking motors or servos? servo is generally used for precise movements rather than the constant rotation of a motor. I would expect a movement you describe to made by a servo used to move an element back then this could be released by a spring?
It's not really the motor/servo you should be concentrating on but the mechanism it is applied to.
When I need this stuff I can usually find it on RS components, for specialist applications I had some terrific motors from a company called Maxon.
cheers,
DS