"I have one friend that pulls the price sticker off his new props and calls them ballanced." - heh... sweet. I'll add to that... I have friends that runway balance their props by lifting the tail of their tail draggers until the prop grinds down to nice an even shape.

Missile, not sure if the trim stuff was in response to my "small movement = big change" example. If it was, I wasn't implicating that you need a meter to set trims. Trims are set in flight, and if you measured everything right, you should need no trim. I was just trying to make the point that a very small error can have a major impact, hence a justification for accurately measuring surface movements.

As for using same holes, etc. In theory, you are correct. With a perfect plane, perfect servos setup, perfect linkages, horns, ames, etc., etc., you would get dual surfaces to match, but this never happens, which is why we have tools to measure and adjust the accuracy of the throw.

Y’s, yeah they would cause a problem… that is another reasons why I believe they should never be used.

Pilot, ¼” means nothing unless we know the size of the plane. Throw meters are not new. Been around for decades. I don’t kit build much (I tend to design and fly), but the last several kits I had mentioned the throw in degrees only. Granted, many beginner/sport kits don’t do this. But if they did, you’d find that almost every plane, regardless of scale, uses similar throws in degrees to get a similar flight response.