Besides the smart guys on this forum, GunBlue490 is where I go for my revolver education. (I've never seen him smack something indiscriminately with a hammer.)
In this video, he covers the cylinder and extraction rod at 45:00 and 1:08:00.
Disassembly and Care of the S&W Revolver ~ Learn how to from a Factory Trained Armorer! - YouTube
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