'38 Ignition Switch Detent Parts?

Someone got into the side of the ignition switch (the chrome lever part, not the electrical) on my '38 and removed what I'm guessing is a ball and a spring and a threaded retainer. The switch works fine, but the lever no longer has the positive OFF-ON positions. QUESTION: Does anyone supply these bits or are they something I can assemble at the store? Picture? Thanks.
 
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