Cheetah reverse manual valve body question

Does anyone know where this check ball goes? I pulled this side cover off and the piston out, tipped it up and the check ball was laying there. Not sure where it goes. It’s a small check ball, already removed the large ball

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Turbo Action Racing and Performance - Racing shifters, transmissions, converters, valve bodies, cheetah e-shift!

Follow above link then look for instructions on the left. Click and find 17156 drawings in pdf format. Hope that helps