It should be fairly easy
Look at the fast idle actuating 'drum'-ie the bit the fast idle lever screws onto.
The pin from the drum will be locating into one of 2 slots/grooves on a plate in the linkage mechanism inside the control box.
Rearrange the linkage mechanism so the pin on the fast idle drum fits into the other slot.
it's easier to do it with the cables disconnected, but make sure the circlips don't ping overboard!
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