The controller has 3 settings that produce different DC voltages for the motor and produce different speeds to the spindle/shutter that results in different shutter speeds. The videos below show the 3 speeds and all these clips have the shutter set to 170 degrees. My first attempt at the linkage had the effect of a tiny amount of open shutter after firing a single frame so Ive rejigged the setup by turning the camera mech 90 degrees.
Below is shuttle cycle showing pin registration during exposure. So the linkage is set up right.