We own a SCM Action TF Conveyor Through-feed electro mechanical cabinet clamp.  It is intended to detect ¾" material on the conveyors, but we wanted the option to run 5/8" material and have it not slip under the optical sensor undetected.  This pushes the optical sensor as low as possible to be tripped by the thinner material.  Has been working without fault for well over a year in the woodshop.