agitador

adj. agitative, causing agitation

n. agitator, incendiary

n. agitator, disturber

= shake mechanism, agitator, provocateur, troublemaker.
Ex: The cylinder machine had no shake mechanism (the device which locked the fibres together in the Fourdrinier machine).
Ex: It was similar to Dickinson's machine, but it had an agitator in the vat to prevent the fibres from being lined up parallel to each other by the action of the cylinder.
Ex: The article is entitled 'Tomorrow's libraries: more than a telephone jack, less than a complete revolution; perspectives of a provocateur'.
Ex: The employee must feel that any problem or complaint will be objectively heard and fairly resolved and that the supervisor will not hold it against the employee or consider him or her a troublemaker.