I like to use nosewheel steering arms....the have longer reach for better throttle resolution. You can get them to fit right over the throttle butterfly shaft after you trim the metal arm off....

Once you get it just right....grind a "flat" on the shaft so it doesn't vibrate loose and locktite it on....away you go...

This is the way BME does it, I think....

Get a equally long arm for your servo and you have very PRECISE throttle control..

High Flights@!
CrazyHerb