Simple stuff tonight , had a big day at work . I drilled the light backs and put selftappers in them . The holes in the frame were the right size for rawlplugs so they were an easy trial fit . Took them off left the screws in and put them in my lathe ...ok I don't have a lathe ...I put them in the chuck of my cordless span it up and hit them with Emery cloth to reveal the alloy .