Guys - I took a few minutes to measure my arrow with calipers - GoldTip XT 5575 and drew it to scale - the vanes and helical to scale......

The little dots represent 1/16" rest prongs.... The drawing does not even show the ' bases' of the vanes..... Just goes to show that clearance of your vanes is a measure of 1/100" maybe 2 if you have 3-4 degrees..... The longitudal drawing shows vanes at 2,3,4 degrees.....

Interesting food for though........ After looking at so many rests I decided to do these drawingd to get a technical look at what I am dealing with - makes ya wonder how any of us ever get a carbon arrow through the rest without contact !!!!