[nelsb01]

It becomes part of a compiled assembly. The bucket, then the reflector (held in place by brass clips), then the square cork gasket, then the lens is held on the steel rim by the 3 clips and the steel rim slips over a lip at the top of the bucket and the bottom spring loaded clip goes through the two lips at the bottom of the bucket.
Suggest that you lay the parts out and see how they go together before trying to put them together. I believe it will save your glass lens from the down fall of gravity and the cement floor.