Ben, I have the same problem finding caps that fit. I would never do this with a vintage cap, but with a modern cap, I soak it water, place it on top of a bowl that's slightly larger, and pull the sides down tight until it wraps around the bowl. When the cap dries out, I remove the bowl, and the cap is definitely larger. It's a little stiff, but the modern caps end up stiff from sweat and heat anyway. After a while, it basically shrinks back to its original size, so I repeat the process.
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