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I was trying to get the knob off so I could potentially increase the amount of hot water getting mixed and it seemed to be coming off nicely but then snapped. By nicely, I mean it was a steady process; the thing was rusted/stuck on so bad I'm not sure it would have been possible to get off without breaking it.

knob faceplate

I can turn the water on and off with pliers but that's not ideal obviously. Primarily I need some instruction on how to get this existing set up replaced with something new that has good hot water management. I see some screws but am not sure if I should do anything else without some guidance as to what it does (the ominous left only screw).

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Here's a link to the Installation, Operation & Service Instructions (PDF) that contain an exploded diagram of all the parts of your valve.

enter image description here
Click for larger view

If you scroll down you even get detailed instructions about servicing the valve, how to order parts, and troubleshooting for common problems (like not getting enough hot water).

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I don't think that's the right diagram? It's similar but not exact anyways. – Enigma Mar 11 '13 at 20:06

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