When they cured, I used a bench mounted disc sander to shape them into a blunt pyramid. I drilled a 3/16″ cavity 1″ deep into the blunt end to accept the tower legs. This cavity allows for an adjustment while fitting the trestle into the canyon. Cut the bottom of the tower legs about ½” inch shorter than needed to reach the ground. Next, slip the tower leg into the cavity of the pyramid footing. After checking the fit to the rock, use a file to fit the pyramid base to the rock. I repeated the process with each tower leg.