The spring clip goes into a slot at the top of the headlight bucket and the bezel snaps over the light. The screw secures the assembly. You do have the rubber ring that the clip holds to the bezel, correct? Properly assembled this seems secure to me.
Kent


1937 Chevy 1/2 ton
1942 Chevy 1/2 ton
1947 Diamond T Model 509
1951 Chevy 1/2 ton
1950 Chevy COE Model 5700 ~ "Barney" ~ And more pix