there is a ring under the outer bezel that holds the sealedbeam lamp inplace that screws into the housing. the trim ring is slightly sprung and does not want to stay together at the bottom. its as though the outer ring is not tight enough to compress the trimring shut, it has an unsightly gap. when i disassembled it i noticed a small piece of brown plastic 1/2" long, maybe 1/8 thick lying atop the trim ring, beneath the outer ring..im wondering if the previous owner didnt install it as a shim to keep the ring together at the bottom. any suggestions or thoughts of similar issues much appreciated.