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690 Posts
Check out my thread listed below. I did just what you were thinking. My vanes are 7/8" from nock. The closer you can get with clearance to the back of arrow the better. Theory is it stabilizes Broadheads quicker and better.
http://www.archerytalk.com/vb/showthread.php?t=872360
http://www.archerytalk.com/vb/showthread.php?t=872360