Clamping anchors, kits, and related methods. The present anchors comprise a body with proximal base and distal blade configured to rotate relative to the base. The base defines a channel through which a screw or pin is advanced to apply force to a moment arm projection to rotate the blade and can also include a secondary moment arm offset longitudinally from the transverse line toward the distal end of blade. The moment arm(s) can be straight, curved, or angled surfaces that apply sufficient bending moment to rotate the blade up to 90 degrees or more relative to longitudinal axis. Kits comprise one or more anchors and a screw. The methods comprise inserting an anchor through substrate, advancing a screw through the channel so the distal end pushes the moment arm toward the distal end of anchor causing the blade to bend, at the transverse line, away from the longitudinal axis.