Isn't there a small screw above the post that goes through the mount? If so, loosen that thing up a bit and slide the rest right or left. Maybe it's a different model, but that's how the ones I've toyed with work.
A forum community dedicated to bow and crossbow owners and archery enthusiasts. Come join the discussion about optics, hunting, performance, troubleshooting, styles, reviews, accessories, classifieds, and more!