Andy Dingley wrote:

My wooden dogs are maple, with hickory springs screwed onto the side.
I adjust the spring presure by paper shims under the spring, where
it's screwed down.
Thanks, Andy. I did a cruder version of just that. My springs are
glued rather than screwed (lack of foresight on the part of their
builder) but a small piece of wood inserted near the attachment point
serves as an adequate (if not easily fine-tuned) shim.

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