Matthew C Chapel Hill , NC July 19, 2015 Lower cam replacement I left the door on. I shimmed it with wood blocks an a magazine. Adjusting the number of pages under wood gave a snug, customer fit. I only replaced the lower block. I would recommend getting the complete dual door kit, with both upper and lower cams. It's only a couple of bucks more and then you have a brand new system. 2 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: 15-30 minutes