OK, here's the first of many films re-discovered in the National Archives....

WHERE AND HOW FORDS ARE MADE (part 1)
Produced by Ford Motor Co. [1919]. 194 ft., si, b&w, 35mm. Captions. {200FC-190(b)}
Worker on assembly line.
“Assembling the spindle connecting rod.”
Worker assembling.
“Assembling the spring and radius rod.”
Worker assembling.
“Assembling the front axle unit to the frame.”
Worker assembling.
“Placing the frame on the conveyor where the first operation is to hang the rear axle.”
Workers put car frame on conveyor.
“The motor unit, which includes the transmission, starting motor and generator is completely assembled before being placed in the car.”
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Part 2 soon.