ive got a www.peepeliminator.com and i have a constant anchor pt.
since my sight pins were already set at 20,30, and 40yrds, all i had to do was line up my peepeliminator with my peepsight, and my 40yrd pin, and then take out the peepsight, and fine tune. so when aiming - the 40yrd pin is alighned like a rifle sight with the peepeliminator and i just put my 20yrd pin on the target. which leaves no "obstructions"/lose periphial vision like with the peepsight (the one i had anyways)

i know its kinda confusing - check out the website, they probably do a better job of explaining it.