Mine are 1" from the shaft end and 1 & 18/32" measured from the nock grove. That's a little farther forward than most but I don't want anything touching my face or mask when I'm wearing one. The important thing is, how well are your arrows grouping?
The farther back the better - but you dont want them touching your face or anything else. Tape some to a bare shaft and move them around and test for clearance, then measure that distance for future reference.
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