In thinking a little more about this, you could probably drill all the way
through the pin and use longer metal rods and just one compression spring.
As you squeezed the rods into place with your fingers, the spring would be
sandwiched between the metal pins and should still work fine. Getting the
pin length exactly right might be a bit tricky but this would give you
nearly solid metal support across the whole width of the wooden pin.

Zachary Dillinger
517-231-3374