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dumb magnifier question

schlaiek

LR noob
Full Member
Minuteman
Feb 10, 2013
486
139
Minneapolis
I'm not new to red dot sites, but I am new to magnifiers. I've always been a LVPO or red dot guy, but I decided to buy an aimpoint 3x magnifier to see how they work.

I like the concept, but I'm riding the struggle bus regarding diopter setting. according the Aimpoint (instructions linked below) the diopter is a simple clockwise/counter-clockwise rotation. however, I can't get my to move. I haven't tried anything other than my hand, but I've had zero movement. am I missing something?