Saw your video- the upper arm should come from the gas pedal. This arm should be spring loaded towards the rear of the machine (at the mixer shaft). The spring to accomplish this should be under the floorboard up at the gas pedal.

The lower arm comes from the engine governor (not a choke assy). This arm should be spring loaded towards the front of the machine (at the mixer shaft). The spring to accomplish this is at the base of the governors arm.

The theory of operation is as follows:
The arm from the gas pedal is spring loaded to the idle position.
The arm from the governor assy is spring loaded towards full throttle. The gas pedal spring (being stronger) pushes the arm on the mixer shaft which in turn rotates the mixer shaft to idle (when no pressure is applied to the gas pedal). As pressure is applied to the gas pedal, the gas pedal arm on the mixer shaft is pulled towards the front of the unit, allowing the arm from the governor to rotate the mixer shaft towards full throttle. Once the governed speed is reached, the governor pulls back on the governors arm (overcoming spring tension), rotating the shaft in the mixer back towards idle. This is done no matter what position the gas pedal may be in.

Hope that made sense-just like L1ftmech said- I'm just long winded :)