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Thermostat By-pass Plate

I discovered that the previous owner had changed the thermostat and removed the by-pass plate. Since I was unable to locate another by-pass plate, I am designing one from a image from Allen Morris (1252) web-site where a by-pass plate is shown with a caliper measuring one of the features. I then can make a ratio of inches verses image size to get the rest of the dimensions. After I made a paper model I don't understand what retains the plate in the counter-bored hole. If it's a light press-fit it would be lost in the inaccuracies of the dimensioning.
I can't imagine that the plate just sits there even though it is trapped by design.
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