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Update-
I put a gate valve on the cold supply thinking that the cold pressure was too high. This did not fix the problem.
So I turned off the cold and took the mixer valve apart again and found that the hot is barely flowing. I think the hot supply is clogged, but I don't have access to where it connects. I'm thinking about sticking something down in there to try and open it up...can I do serious damage to the mixing valve this way? If I disconnected the hot supply at a point in the basement and tried running cold back down through the supply, will the mixer valve allow this and would it even help? It is a "Kingston" brand mixer valve.
Thanks for any advice, I would love to get this hot supply opened up a bit without tearing into my shower wall!
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