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Text excerpt from page 12 (click to view)
4.2 Take off the housing cover together with dome bubble; then separate housing cover& dome bubble.
4.3 Mount the "ring" onto "housing cover"; then "ring + housing cover" onto the "housing base" accordingly. Secondly install the metal bracket and fasten it by using supplied four (4) screws. Finally snap 2 supplied sheet spring into the chosen hole of bracket based on the thickness of ceiling. Note: User has to adjust the mounting height of sheet spring according to different thickness of ceiling in order to ensure perfect secured mounting mechanism as the below drawing and table.