Comfy Book Opener and Page Keeper

This is a very handy gadget that allows you to comfortably spread pages from a book with one hand. There are several other versions out there but I had to design my own to be big enough for my thumb to slip in (this one's ID is 25mm) and have no sharp edges (all contact edges are filleted at 1mm). Also, I didn't want the rib to be so thick that it could hide more than one line of text from the reader (this one has a thickness of 3mm). So... this is the result.

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