One of the many attention to detail / thieves of time jobs (delete as appropriate). The sequence below shows the installation of the mounts for the spring-loaded catches for the headcode discs. Seen marked up before cutting out, after cutting, after the mounts have been welded in and after priming. They aren't centrally aligned with the holes for the lamp holders, they're centrally aligned with the centre of the lamp lens (not shown). Also, there's only one headcode lamp in the photo - the upper one is the tail lamp - so the top and bottom mounts are positioned relative to the horizontal centre of the disc (also not shown).