Hi Troy

I thought that's what I said.

The farther away from the hinge line the degrees don't change but the point at which the pointer hits the scale will be different.The farther away the larger the space between the scale divisions must be. IMHO the farther out we can measure the more accurate those measurements will be.

If I told you to use Jerry's device and set everything to 10 degrees and you didn't space the scale out the exact same amount as I did your readings will be different than mine.
This is why Jerry added the spacing device on his unit which I love.

Now if we were to read dirrectly from the control surface then this wouldn't matter as degrees would be the same.

Way back when I built my own airplanes I'd put a tube in the elev halves and each aileron to stick those gadget pointers in and they worked slick.