What are these tool items used for?

Amongst the boxes of things I’ve inherited I’ve a couple things I just can’t work out what they were used for. Anyone have any ideas?

Mystery1
This wheel thing looks like steel but feels like graphite. It has a ridge along outer rim. Any idea what this is used for? Photo below

Mystery2
Nickle finial screws. What would someone have used these for woodworking? Lamps? Along side a collection of nickle hinges that are very stiff and seized up any tips how to loosen up appreciated. Photo below !

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