1994 Other Nissan Models Replacing sealed beam

Electrical problem
1994 Other Nissan Models 6 cyl Four Wheel Drive Automatic 200k miles

I am trying to replace a sealed beam (front headlight) on my 1984 Nissan Patrol Ti. I am finding it impossible to refit the circular chrome surround that holds the sealed beam firmly in place. Is there a simple way to fit this surround. It fits around the edge of the sealed beam and attaches with 3 small screws.