How To Install Truck Knucks First remove end cap on bed rail Keep the Truck Knuck assembled Loosen the knob until it is almost all the way unthreaded holding on by just a few threads Press down on the knob so that it's flush with the cleat Insert the bolt head into the bed rail while compressing the knob while compressing the knob, slide the Truck Knuck Into desired position Tighten the knob to secure Truck Knuck into place Now your ready to tie down your load in your truck bed