Was about to fit a better headlamp than my current one, with MOT neasurement of beam pattern in mind. Unfortunately, found that the locating pin/arm/rod which the reflector is held by has lost it`s 3 point plastic locator `locknut` . The rod is actually knurled, and the plastic, as you can see has snapped off - any ideas for holding this in place? Thoughts so far include the right diameter 'starlock' washer or a big dollop of gluegun glue. Can't get in to cut a thread with a die.