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-Keep one scale thinner than the other...the thin side will bend more than the other. The difference is very slight, doubtful that the eye can even pick up on it.

-Keep the wedge pin just snug,...

For centering blades I only glue one side of the wedge and only "snug" the wedge pin. A little flexing of the scales will sometimes help to center the blade. Nice save, I'm sure it will be a great...