Throttle Arm/Pulley Calculator

This will work Throttle Arm Length and Throttle pulley Radius.
Measure the amount of pull on the cable from foot off to flat on the floor, the cable thickness and the Butterfly's Anglular Movement on your carb. This normally 78 or 90 degs
Use can use any units as long as they are all the same.
This can be used anywhere you need to use a cable and arm or pulley.
Throttle Arm Length is the distance between the centre of the throttle shaft and the point your cable attaches to.
The theoretical radius is through the centre of the cable.
The Pulley Radius is the radius your cable sits on.
The easy option is to cut out this radius using the same thickness matial as the cable and then make 2 side plate to hold the cable in place