Maybe they're out there somewhere, but I have never seen or heard of a model that tracks straight without some right thrust. My Venus II has a lot of right thrust - I don't know exactly how much, but at least 3 degrees, perhaps more - and it tracks straight as an arrow with dead-neutral rudder. It would not do that without right thrust.

Okay with me if guys want to fly with a lot of right rudder trim or use a throttle/rudder mix, but these simply mask the issue of insufficient right thrust.

One might be able to calculate right thrust measuring tip-to-tip, assuming the plane is built square (which is a BIG assumption with most ARF's), but the purpose of the CF rod method posted above is to get the prop to exit the cowl on the centerline of the fuse, not to measure right thrust.