Have you tried moving the items all across the surface of the table? Sometimes an item needs to be placed over a certain area of the tabletop, in order for the "gear" icon to appear, indicating you can use the item there.
Other than that, I can't recall anything else about the puzzle that you may have missed.
If all else fails, talk to Poirot.
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"Jatsie is amazing." - Jazhara
"My mental image of Jat is a gentleman sitting in a leather armchair, wearing a robe. The light in the room is dim and strangely he's not sitting in front of a computer, but next to a small, round table with a box of cigars on." - Jelena
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