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As Big hammer alluded to, the contact in the repro switches are made of copper, and are not very springy. The originals were made from a bronze alloy, and are much more springy. The original contact looks a little more yellowish compared to the copper color of the repro. Try to find an original at a swap meet. If you housing is corroded and you don't want to have it replated, you can swap out the original contact into the repro housing.