What's the (installation) Trick?: Headlamp Bezel/Trim Ring

And I suppose I don't need to say to make sure the head lamp is not sitting up too high in the bucket, Not all modern headlamps fit in the older buckets. Sometimes there are buttons on the back of the reflectors, that have no corresponding divots in the buckets. This usually makes it difficult or impossible to install the retaining rings tho.
I say this because your sealed beam is not centered properly, and your bezel may be getting stuck ontop of the lens instead of sliding in beside it.