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The Testament of Sherlock Holmes Hints
How can I find the other cog?
1 of 11: Switch to Watson to discover that some of the flour from the cut-open sacks has fallen down onto the nearby chest. (NOTE: You could've done this at any time after cutting open the flour sacks in the attic.)
2 of 11: Click on the chest to get a close-up, then notice that some of the flour is visible over to the left.
3 of 11: Watson's idea is to use the flour to figure out which of the chest's number buttons have been used the most. Those'll be the ones that are needed to open it.
4 of 11: In order to spread the flour over the buttons, you'll need some sort of brush.
8 of 11: After that, you'll need to find the cog Holmes needs, since it's not in the chest.
9 of 11: The wounded men know where it's hidden.
10 of 11: Talk to the man who isn't mute or deaf to learn that it's under the wood next to the fireplace.
11 of 11: Click on the pile of wood that's to the left of the fireplace to get a close-up, then click on the wood to move it aside and find the cog (which Watson calls a gear).