This is a carb off of a 1940 single cylinder Champion Kingfisher, 3.2 hp.
It may be the same as yours. There’s a long nut with an arm attached to
the carb. The arm rides on a cam on the mag plate which operates the
throttle.
I assume your rope pulley would look like this……
This is what the tiller arm looks like on my Kingfisher……
Prepare to be boarded!